雅思基础语法练习及答案
雅思基本语法状从练习
A 从句改错1, It is you which decides your future.2, I don’t believe what our future has already been decided.3, Expensive restaurants do not let in people who clothing is untidy.4, We should decide now that we can do for the next generation.5, A number of people make online communities which they can make friends.6, The government should help people who cannot take care of themselves.7, I would like to build a small house that I can live with my family.8, You should follow your own rules what guide your behavior.9, Scientists wonder why we will have another ice age in the future or not.10, Some people do not realize how much we rely on natural resources.11, Who are confident in their knowledge do not hesitate to speak in public.12, Th ere is no room for doubt that modern technology has increased people’s quality of life.B 条件状语从句1，如果水在100度沸腾，它就转化成蒸汽。
雅思基础语法练习及答案
雅思基础语法练习1.Science still a cure for cancer.a .doesn’t find c.hasn’t foundb .haven’t found d.aren’t finding2.While he a route to the Indies, Columbus discoveredAmerica.a .searched c.had searched forb .was discovering d.was searching for3.Existing reserves of fossil fuel by 2045.a .have been run out c.is going to be run outb .will have run out d.have run out4.If logging of tropical rainforests continues at the present rate,a 30 per cent increase in atmospheric CO2 by the year 2000.a .there will be c.there would beb .there might have been d.there could not have been5.Only by investing heavily in value-added exportsfrom the present trade imbalance.a .the country can emerge c.can the country emergeb .the country mightemerged.the country emerged6.The mystery of the double helix , the scope for geneticengineering dramatically increased.a having solved c solving..b .having been solved d.solved7.Since the mid-’60s considerable research in embryotransplants .a .has carried out c.has been carried outb .was done d.was carried out8.several hypotheses have been advanced for thedisappearance of the dinosaur, no conclusive evidence supports any of them.a .despite c.althoughb .in spite of d.in spite of the fact9.Until the 16th century the earth to be flat.a .is believed c.believedb .has been believed d.was believed1 0.If the temperature of the reactor 500C higher meltdown would have occurred.a.was c.was beingb.had been d.had1 1.adequate precautions are take, there is no risk involved in the operation.a.Although c.Neverthelessb .Providing d.Even12.My supervisor advised me to the problem.a .look ahead c.look out ofb .look down d.look into13.The more acid you add to the solution, it becomes.a .cloudier c.the cloudiestb .the cloudier d.more cloudy1 4.The lecturer said ‘It’s time you the literature review.’a.began c.should beginb.begin d.are beginning1 5.After studying our experimental results, the tutor suggested the experiment.a.us to repeat c.we repeatb.that we to repeat d.me to repeat1 6.After your results you should make an appointment with your tutor.a.you receiving c.you have receivedb.you would have received d.you received17.You the experiment twice, not once.a .should have carried out c.haven’t carried outb .shouldn’t have carriedoutd.couldn’t have carried out18.It looks you’ve made a mistake.a .as c.ifb .as though d.perhaps19.After receiving her results, the student stopped .a .to worry c.worryingb .having worried d.to be worried20.You include this section. It is not necessarya .must c.don’t needb .couldn’t d.don’t have to2 1.Unless an extension at least one week before the due date, it will not be given.a.you request c.you requestedb.you will request d.requesting2The assignment made me .2.a .to think hard c.think hardb .thinking hard d.thought hard23.The scientists were prohibited the danger zone.a .to enter c.enterb .entering d.from entering24.the right answer I would have got full marks.a .Had I known c.If I’ll knowb .if I would have known d.If I was knowing2 5.The results were convincing that we decided to publish them.a.so c.veryb.such d.so much26.way you do it, the answer is always the same.a .However c.Who everb .whichever d.Why ever2 7.producing methane, the process also produces carbon monoxide.a.Apart c.Besidesb .As well d.In addition2 8.The biologist admitted excessive numbers of animals in laboratory tests.a.using c.being usedb.to use d.used2 9.A whale is a mammal, it is warm-blooded and gives milk to its young.a.who c.which means thatb.which d.that3.He appears minor problems.a .to have had c.was havingb .having d.hadGrammar Practice Answer1.C11.B21.a2. d 12.D22.c3.B13.B23.d4.A14.A24.a5.C15.C25.a6.A16.C26.b7.C17.A27.c8.C18.B28.a9.D1C2c9. 9. 10. B 20. D 30.a。
雅思基础语法练习及答案说课材料
雅思基础语法练习及答案雅思基础语法练习1. Science still a cure for cancer.a. doesn’t find c. hasn’t foundb. haven’t found d. aren’t finding2. While he a route to the Indies, Columbus discovered America.a. searched c. had searched forb. was discovering d. was searching for3. Existing reserves of fossil fuel by 2045.a. have been run out c. is going to be run outb. will have run out d. have run out4. If logging of tropical rainforests continues at the present rate, a 30 per cent increasein atmospheric CO2 by the year 2000.a. there will be c. there would beb. there might have been d. there could not have been5. Only by investing heavily in value-added exports from the present trade imbalance.a. the country can emerge c. can the country emergeb. the country might emerge d. the country emerged6. The mystery of the double helix , the scope for genetic engineering dramaticallyincreased.a. having solved c. solvingb. having been solved d. solved7. Since the mid-’60s considerable research in embryo transplants .a. has carried out c. has been carried outb. was done d. was carried out8. several hypotheses have been advanced for the disappearance of the dinosaur, noconclusive evidence supports any of them.a. despite c. althoughb. in spite of d. in spite of the fact9. Until the 16th century the earth to be flat.a. is believed c. believedb. has been believed d. was believed10. If the temperature of the reactor 500C higher meltdown would have occurred.a. was c. was beingb. had been d. had11. adequate precautions are take, there is no risk involved in the operation.a. Although c. Neverthelessb. Providing d. Even12. My supervisor advised me to the problem.a. look ahead c. look out ofb. look down d. look into13. The more acid you add to the solution, it becomes.a. cloudier c. the cloudiestb. the cloudier d. more cloudy14. The lecturer said ‘It’s time you the literature review.’a. began c. should beginb. begin d. are beginning15After studying our experimental results, the tutor suggested the experiment..a. us to repeat c. we repeatb. that we to repeat d. me to repeat16After your results you should make an appointment with your tutor..a. you receiving c. you have receivedb. you would have received d. you receivedYou the experiment twice, not once.17.a. should have carried out c. haven’t carried outb. shouldn’t have carried out d. couldn’t have carried outIt looks you’ve made a mistake.18.a. as c. ifb. as though d. perhapsAfter receiving her results, the student stopped .19.a. to worry c. worryingb. having worried d. to be worried20. You include this section. It is not necessarya. must c. don’t needb. couldn’t d. don’t have to21. Unless an extension at least one week before the due date, it will not be given.a. you request c. you requestedb. you will request d. requesting22. The assignment made me .a. to think hard c. think hardb. thinking hard d. thought hard23. The scientists were prohibited the danger zone.a. to enter c. enterb. entering d. from entering24. the right answer I would have got full marks.a. Had I known c. If I’ll knowb. if I would have known d. If I was knowing25. The results were convincing that we decided to publish them.a. so c. veryb. such d. so much26. way you do it, the answer is always the same.a. However c. Who everb. whichever d. Why ever27.producing methane, the process also produces carbon monoxide.a. Apart c. Besidesb. As well d. In addition28.The biologist admitted excessive numbers of animals in laboratory tests.a. using c. being usedb. to use d. used29.A whale is a mammal, it is warm-blooded and gives milk to its young.a. who c. which means thatb. which d. that30.He appears minor problems.a. to have had c. was havingb. having d. hadGrammar Practice Answer1. C 11. B 21.a2. d 12. D 22.c3. B 13. B 23.d4. A 14. A 24.a5. C 15. C 25.a6. A 16. C 26.b7. C 17. A 27.c8. C 18. B 28.a9. D 19. C 29.c10. B 20 D 30 a. .。
雅思基础语法练习及答案
小黑雅思基础语法练习及答案语法练习Complete the following sentences by circling the missing words.1. Science still a cure for cancer.a. doesn’t find c. hasn’t foundb. haven’t found d. aren’t finding2. While he a route to the Indies, Columbus discovered America.a. searched c. had searched forb. was discovering d. was searching for3. Existing reserves of fossil fuel by 2045.a. have been run out c. is going to be run outb. will have run out d. have run out4. If logging of tropical rainforests continues at the present rate, a 30 per cent increase inatmospheric CO2 by the year 2000.a. there will be c. there would beb. there might have been d. there could not have been5. Only by investing heavily in value-added exports from the present trade imbalance.a. the country can emerge c. can the country emergeb. the country might emerge d. the country emerged6. The mystery of the double helix , the scope for genetic engineering dramatically increased.a. having solved c. solvingb. having been solved d. solved7. Since the mid-’60s considerable research in embryo transplants .a. has carried out c. has been carried outb. was done d. was carried out8. several hypotheses have been advanced for the disappearance of the dinosaur, noconclusive evidence supports any of them.a. despite c. althoughb. in spite of d. in spite of the fact9. Until the 16th century the earth to be flat.a. is believed c. believedb. has been believed d. was believed10. If the temperature of the reactor 500C higher meltdown would have occurred.a. was c. was beingb. had been d. had11. adequate precautions are take, there is no risk involved in the operation.a. Although c. Neverthelessb. Providing d. Even12. My supervisor advised me to the problem.a. look ahead c. look out ofb. look down d. look into13. The more acid you add to the solution, it becomes.a. cloudier c. the cloudiestb. the cloudier d. more cloudy14. The lecturer said ‘It’s time you the literature review.’a. began c. should beginb. begin d. are beginning15. After studying our experimental results, the tutor suggested the experiment.a. us to repeat c. we repeatb. that we to repeat d. me to repeat16. After your results you should make an appointment with your tutor.a. you receiving c. you have receivedb. you would have received d. you received17. You the experiment twice, not once.a. should have carried out c. haven’t carried outb. shouldn’t have carried out d. couldn’t have carried out18. It looks you’ve made a mistake.a. as c. ifb. as though d. perhaps19. After receiving her results, the student stopped .a. to worry c. worryingb. having worried d. to be worried20. You include this section. It is not necessarya. must c. don’t needb. couldn’t d. don’t have to21. Unless an extension at least one week before the due date, it will not be given.a. you request c. you requestedb. you will request d. requesting22. The assignment made me .a. to think hard c. think hardb. thinking hard d. thought hard23. The scientists were prohibited the danger zone.a. to enter c. enterb. entering d. from entering24. the right answer I would have got full marks.a. Had I known c. If I’ll knowb. if I would have known d. If I was knowing25. The results were convincing that we decided to publish them.a. so c. veryb. such d. so much26. way you do it, the answer is always the same.a. However c. Who everb. whichever d. Why ever27. producing methane, the process also produces carbon monoxide.a. Apart c. Besidesb. As well d. In addition28. The biologist admitted excessive numbers of animals in laboratory tests.a. using c. being usedb. to use d. used29. A whale is a mammal, it is warm-blooded and gives milk to its young.a. who c. which means thatb. which d. that30. He appears minor problems.a. to have had c. was havingb. having d. hadGrammar Practice Answer1. C 11. B 21. a2. d 12. D 22. c3. B 13. B 23. d4. A 14. A 24. a5. C 15. C 25. a6. A 16. C 26. b7. C 17. A 27. c8. C 18. B 28. a9. D 19. C 29. c10. B 20. D 30. a小黑雅思培训已经推出：●雅思学员在线雅思口语学习平台；●在线雅思语法学习平台；●雅思阅读听力在线训练平台；●首家雅思视频网校；●《剑桥雅思八全真试题解析》在线预订和购买平台小黑雅思更多资料欢迎关注官方更新：电话：400-600-7921 （24小时客服）网站：博客：/eng86（全国公共雅思资料分享）微博：/liuzhiyun（小黑雅思学员全国服务平台，每日更新）信箱：*****************（小黑正式出版书籍答疑专用信箱）。
雅思基础语法练习及答案
雅思基础语法练习1. Science still a cure for cancer.a. doesn’t find c. hasn’t foundb. haven’t found d. aren’t finding2. While he a route to the Indies, Columbus discovered America.a. searched c. had searched forb. was discovering d. was searching for3. Existing reserves of fossil fuel by 2045.a. have been run out c. is going to be run outb. will have run out d. have run out4. If logging of tropical rainforests continues at the present rate, a 30 per cent increase inatmospheric CO2 by the year 2000.a. there will be c. there would beb. there might have been d. there could not have been5. Only by investing heavily in value-added exports from the present trade imbalance.a. the country can emerge c. can the country emergeb. the country might emerge d. the country emerged6. The mystery of the double helix , the scope for genetic engineering dramatically increased.a. having solved c. solvingb. having been solved d. solved7. Since the mid-’60s considerable research in embryo transplants .a. has carried out c. has been carried outb. was done d. was carried out8. several hypotheses have been advanced for the disappearance of the dinosaur, noconclusive evidence supports any of them.a. despite c. althoughb. in spite of d. in spite of the fact9. Until the 16th century the earth to be flat.a. is believed c. believedb. has been believed d. was believed10. If the temperature of the reactor 500C higher meltdown would have occurred.a. was c. was beingb. had been d. had11. adequate precautions are take, there is no risk involved in the operation.a. Although c. Neverthelessb. Providing d. Even12. My supervisor advised me to the problem.a. look ahead c. look out ofb. look down d. look into13. The more acid you add to the solution, it becomes.a. cloudier c. the cloudiestb. the cloudier d. more cloudy14. The lecturer said ‘It’s time you the literature review.’a. began c. should beginb. begin d. are beginning15. After studying our experimental results, the tutor suggested the experiment.a. us to repeat c. we repeatb. that we to repeat d. me to repeat16. After your results you should make an appointment with your tutor.a. you receiving c. you have receivedb. you would have received d. you received17. You the experiment twice, not once.a. should have carried out c. haven’t carried outb. shouldn’t have carried out d. couldn’t have carried out18. It looks you’ve made a mistake.a. as c. ifb. as though d. perhaps19. After receiving her results, the student stopped .a. to worry c. worryingb. having worried d. to be worried20. You include this section. It is not necessarya. must c. don’t needb. couldn’t d. don’t have to21. Unless an extension at least one week before the due date, it will not be given.a. you request c. you requestedb. you will request d. requesting22. The assignment made me .a. to think hard c. think hardb. thinking hard d. thought hard23. The scientists were prohibited the danger zone.a. to enter c. enterb. entering d. from entering24. the right answer I would have got full marks.a. Had I known c. If I’ll knowb. if I would have known d. If I was knowing25. The results were convincing that we decided to publish them.a. so c. veryb. such d. so much26. way you do it, the answer is always the same.a. However c. Who everb. whichever d. Why ever27. producing methane, the process also produces carbon monoxide.a. Apart c. Besidesb. As well d. In addition28. The biologist admitted excessive numbers of animals in laboratory tests.a. using c. being usedb. to use d. used29. A whale is a mammal, it is warm-blooded and gives milk to its young.a. who c. which means thatb. which d. that30. He appears minor problems.a. to have had c. was havingb. having d. hadGrammar Practice Answer1. C 11. B 21. a2. d 12. D 22. c3. B 13. B 23. d4. A 14. A 24. a5. C 15. C 25. a6. A 16. C 26. b7. C 17. A 27. c8. C 18. B 28. a9. D 19. C 29. c10. B 20. D 30. a。
雅思基础语法练习及答案
雅思基础语法练习1.Science still a cure for cancer.a. doesn’t findhasn’t foundc.b. haven’t found d. aren’t finding2. While he a route to the Indies, Columbus discovered America.a. searched c. had searched forb. was discovering d. was searching for3. Existing reserves of fossil fuel by 2045.a. have been run out c. is going to be run outb. will have run out d. have run out4. If logging of tropical rainforests continues at the present rate, a 30 per cent increase inatmospheric CO2 by the year 2000.a. there will be c. there would beb. there might have been d. there could not have been5. Only by investing heavily in value-added exports from the present trade imbalance.a. the country can emerge c. can the country emergeb. the country might emerge d. the country emerged6. The mystery of the double helix , the scope for genetic engineering dramatically increased.a. having solved c. solvingb. having been solved d. solved7. Since the mid-’60s considerable research in embryo transplants .a. has carried out c. has been carried outb. was done d. was carried out8. several hypotheses have been advanced for the disappearance of the dinosaur, noconclusive evidence supports any of them.a. despite c. althoughb. in spite of d. in spite of the fact9. Until the 16th century the earth to be flat.a. is believed c. believedb. has been believed d. was believed10. If the temperature of the reactor 500C higher meltdown would have occurred.a. was c. was beingb. had been d. had11. adequate precautions are take, there is no risk involved in the operation.a. Although c. Neverthelessb. Providing d. Even12. My supervisor advised me to the problem.a. look ahead c. look out ofb. look down d. look into13. The more acid you add to the solution, it becomes.a. cloudier c. the cloudiestb. the cloudier d. more cloudy14. The lecturer said ‘It’s time you the literature review.’a. began c. should beginb. begin d. are beginning15. After studying our experimental results, the tutor suggested the experiment.a. us to repeat c. we repeatb. that we to repeat d. me to repeat16. After your results you should make an appointment with your tutor.a. you receiving c. you have receivedb. you would have received d. you received17. You the experiment twice, not once.a. should have carried out c. haven’t carried outb. shouldn’t have carried out d. couldn’t have carried out18. It looks you’ve made a mistake.a. as c. ifb. as though d. perhaps19. After receiving her results, the student stopped .a. to worry c. worryingb. having worried d. to be worried20. You include this section. It is not necessarya. must c. don’t needb. couldn’t d. don’t have to21. Unless an extension at least one week before the due date, it will not be given.a. you request c. you requestedb. you will request d. requesting22. The assignment made me .a. to think hard c. think hardb. thinking hard d. thought hard23. The scientists were prohibited the danger zone.a. to enter c. enterb. entering d. from entering24. the right answer I would have got full marks.a. Had I known c. If I’ll knowb. if I would have known d. If I was knowing25. The results were convincing that we decided to publish them.a. so c. veryb. such d. so much26. way you do it, the answer is always the same.a. However c. Who everb. whichever d. Why ever27. producing methane, the process also produces carbon monoxide.a. Apart c. Besidesb. As well d. In addition28. The biologist admitted excessive numbers of animals in laboratory tests.a. using c. being usedb. to use d. used29. A whale is a mammal, it is warm-blooded and gives milk to its young.a. who c. which means thatb. which d. that30. He appears minor problems.a. to have had c. was havingb. having d. hadGrammar Practice Answer1. C 11. B 21. a2. d 12. D 22. c3. B 13. B 23. d4. A 14. A 24. a5. C 15. C 25. a6. A 16. C 26. b7. C 17. A 27. c8. C 18. B 28. a9. D 19. C 29. c10. B 20. D 30. a。
雅思基础语法班入门测试
• B. the best • C. the most best
24. ____ people live in the countryside than 100 years ago.
• A. Less
• B. Few • C. Fewer
25. The bookshop ____ the end of the road is excellent.
18. The manager interviewed ____candidates in turn.
• A. each of the
• B. each • C. every
19. I know it’s not much of a present but I made it ____.
• A. me
17. For those of you new to the company ,this leaflet is full of ____.
• A. a valuable information
• B. the valuable information • C. valuable information
• A. much
• B. many • C. lots of
16. I don’t know whether to accept the job offer. It’s ____.
• A. a difficult decision
• B. the difficult decision • C. difficult decision
21. The government has released some ____data showing how schools are not providing an adequate education to our children.
雅思英语语法练习题
雅思英语语法练习题雅思英语考试是许多英语学习者在提升语言能力时的重要目标之一。
语法是雅思考试中不可或缺的一部分，它不仅影响着写作部分，也间接影响着听力和阅读的理解。
以下是一些雅思英语语法练习题，旨在帮助学生提高语法水平。
1. 时态一致性练习：- 阅读下列句子，并找出时态使用错误的地方：- "I was walking to the store when I saw my old friend. He said he is going to the same place."- "She was planning to visit her parents last weekend, but she changed her mind."2. 主谓一致练习：- 选择正确的形式填空：- "Neither the students nor the teacher ______ (is/are) late for the class."- "One of the books on the shelf ______ (has/have) a beautiful cover."3. 被动语态练习：- 将下列句子转换为被动语态：- "The company will launch a new product next month." - "Someone has left the door open."4. 非谓语动词练习：- 用正确的非谓语形式填空：- "Seeing the beautiful sunset, ______ (she/wasamazed)."- "To improve her English, ______ (she/reads) English novels every day."5. 定语从句练习：- 完成下列句子：- "The man ______ (who/that) you met at the party is my uncle."- "I will never forget the day ______ (when/which) we graduated."6. 条件句练习：- 将下列句子转换为条件句：- "If I had enough money, I would travel around the world."- "She will pass the exam if she studies hard."7. 比较级和最高级练习：- 用正确的比较级或最高级形式填空：- "This is ______ (good) the most delicious cake I have ever tasted."- "He is ______ (smart) than his brother."8. 直接引语和间接引语练习：- 将下列直接引语转换为间接引语：- "She said, 'I will come to the party.'"- "He asked, 'Do you know her address?'"9. 疑问句和否定句练习：- 将下列陈述句转换为疑问句和否定句：- "They have finished their homework."- "She can speak three languages."10. 情态动词练习：- 用正确的情态动词填空：- "You ______ (must/may) apologize for being late." - "She ______ (could/might) have been a doctor if she had studied harder."练习这些题目可以帮助学生巩固和提高英语语法知识，为雅思考试做好充分准备。
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雅思基础语法练习Complete the following sentences by circling the missing words.1.Science still a cure for cancer.a.doesn’t find c.hasn’t foundb.haven’t found d.aren’t finding2.While he a route to the Indies, Columbus discovered America.a.searched c.had searched forb.was discovering d.was searching for3.Existing reserves of fossil fuel by 2045.a.have been run out c.is going to be run outb.will have run out d.have run out4.If logging of tropical rainforests continues at the present rate, a 30 per centincrease in atmospheric CO2 by the year 2000.a.there will be c.there would beb.there might have been d.there could not have been5.Only by investing heavily in value-added exports from the present tradeimbalance.a.the country can emerge c.can the country emergeb.the country might emerge d.the country emerged6.The mystery of the double helix , the scope for genetic engineeringdramatically increased.a.having solved c.solvingb.having been solved d.solved7.Since the mid-’60s considerable research in embryo transplants .a.has carried out c.has been carried outb.was done d.was carried out8. several hypotheses have been advanced for the disappearance of the dinosaur,no conclusive evidence supports any of them.a.despite c.althoughb.in spite of d.in spite of the fact9.Until the 16th century the earth to be flat.a.is believed c.believedb.has been believed d.was believed10.If the temperature of the reactor 500C higher meltdown would have occurred.a.was c.was beingb.had been d.had11. adequate precautions are take, there is no risk involved in the operation.a.Although c.Neverthelessb.Providing d.EvenMy supervisor advised me to the problem.12.a.look ahead c.look out ofb.look down d.look intoThe more acid you add to the solution, it becomes.13.a.cloudier c.the cloudiestb.the cloudier d.more cloudyThe lecturer said ‘It’s time you the literature review.’14.a.began c.should beginb.begin d.are beginning15After studying our experimental results, the tutor suggested the experiment. . to repeat c.we repeatb.that we to repeat d.me to repeatAfter your results you should make an appointment with your tutor.16.a.you receiving c.you have receivedb.you would have received d.you received17You the experiment twice, not once..a.should have carried out c.haven’t carried outb.shouldn’t have carried out d.couldn’t have carried out18It looks you’ve made a mistake..a.as c.ifb.as though d.perhapsAfter receiving her results, the student stopped .19.a.to worry c.worryingb.having worried d.to be worried20.You include this section. It is not necessarya.must c.don’t needb.couldn’t d.don’t have to21.Unless an extension at least one week before the due date, it will notbe given.a.you request c.you requestedb.you will request d.requesting22.The assignment made me .a.to think hard c.think hardb.thinking hard d.thought hardThe scientists were prohibited the danger zone.23.a.to enter c.enterb.entering d.from enteringthe right answer I would have got full marks.24.a.Had I known c.If I’ll knowb.if I would have known d.If I was knowingThe results were convincing that we decided to publish them.25.a.so c.veryb.such d.so muchway you do it, the answer is always the same.26.a.However c.Who everb.whichever d.Why everproducing methane, the process also produces carbon monoxide.27.a.Apart c.Besidesb.As well d.In additionThe biologist admitted excessive numbers of animals in laboratory tests.28.ing c.being usedb.to use edA whale is a mammal, it is warm-blooded and gives milk to its young.29.a.who c.which means thatb.which d.that30.He appears minor problems.a.to have had c.was havingb.having d.hadGrammar Practice Answer1.C11.B21.a2. d 12.D22.c3.B13.B23.d4.A14.A24.a5.C15.C25.a6.A16.C26.b7.C17.A27.c8.C18.B28.a9.D19.C29.c10.B20.D30.a。