第五单元测试题
人教版PEP四年级英语上册《unit5 第五单元测试卷》(附答案)

人教版PEP四年级英语上册Unit 5测试卷(满分:100分)一、听录音,选出你听到的单词。
每小题听一遍。
(10分)()1. A. kitchen B. chicken C. chopsticks()2. A. fork B. four C. five()3. A. knife B. fridge C. beef()4. A. he B. she C. we()5. A. bed B. let C. red二、听录音,判断下列图片与所听内容是(√)否(×)相符。
每小题听两遍。
(10分)()1. ()2. ()3.()4. ()5.三、听录音,选出正确的选项补全句子。
每小题听两遍。
(10分)()1. I’d like some _________.A. fish and riceB. rice and juiceC. noodles and rice ()2. It’s _________ yuan.A. fourB. fiveC. nine()3. Would you like some _________?A. beef and fishB. vegetables and milkC. chicken and soup ()4. _________ is ready.A. BreakfastB. LunchC. Dinner()5. I can use _________.A. chopsticks and the forkB. chopsticks and the spoonC. the knife and fork四、听录音,根据喜欢的食物在相应的人物下方打“√”。
每小题听两遍。
(10分)Name Tim Tomfishricebeefsoupmilk五、选出每组单词中画线部分发音不同的一项。
(5分)()1. A. he B. she C. five()2. A. pen B. meet C. ten()3. A. get B. let C. we()4. A. yes B. pen C. be()5. A. me B. bed C. beef六、看图选单词。
小学数学第五单元《面积》 单元测试(含答案解析)

小学数学第五单元《面积》单元测试(含答案解析)一、选择题1.一块长方形的玻璃,长是10分米,宽是6分米,如果长和宽都减少2分米,则面积减少()平方分米。
A. 32B. 4C. 28D. 182.有三块铁皮,面积分别是9平方分米、90平方分米和900平方分米。
()块铁皮的面积最接近1平方米。
A. 9平方分米B. 90平方分米C. 900平方分米3.在边长是12厘米的正方形中,剪直径是2厘米的圆,最多能剪()个。
A. 36B. 18C. 484.如图中的每个小正方形表示1平方厘米.那么,这个长方形的面积是()平方厘米.A. 6B. 24C. 28D. 325.把一个长10米,宽8米,高6米的长方体分成两个相同的长方体,表面积之和最少增加()平方米。
A. 160B. 96C. 120D. 886.周长是80米的正方形,面积是()。
A. 20平方米B. 80平方米C. 400平方米D. 6400平方米7.学校有一块正方形草坪,正好能容纳100个小朋友做广播操。
这块草坪的面积大约是()。
A. 150平方米B. 1500平方分米C. 1500平方米8.从一个长9厘米,宽6厘米的长方形纸上剪去一个最大的正方形,剩下部分的面积是()平方厘米。
A. 9B. 36C. 189.下面()的面积最接近1平方分米。
A. 一张电影海报B. 大拇指的指甲盖C. 粉笔盒的一个面10.一个长方体水池,长20米,宽10米,深2米,占地()平方米.A. 200B. 400C. 52011.下面三个图形中,()的面积最大。
(每个□代表1平方厘米。
)A. B. C.12.小巧和小丁丁分别拿出盒子的两个面比大小,如图所示,他们分别用小正方形铺满两个面,你觉得哪个面大?()A. 1号图大B. 2号图大C. 一样大D. 无法比较二、填空题13.把一个棱长1m的正方体切成棱长1cm的小正方体,可以切成________块,如果把这些小正方体排成一行,一共长________m.14.边长1米的正方形,面积是________,可以写作________。
五年级数学下册第五单元《图形的运动》测试-人教版(含答案)

五年级数学下册第五单元《图形的运动》测试-人教版(含答案)一.选择题(共5题,共10分)1.美丽的图案都用到了()A.平移B.旋转C.平移、旋转和对称2.冬天时你见过雪花吗?它是以花心为中心,一个花瓣旋转6次得到的美丽图案。
那么每次它旋转多少度?()A.30°B.60°C.90°D.180°3.下面()图是把沿顺时针方向旋转了90°。
A. B. C.4.在旋转过程中,确定一个图形旋转后的位置,除了需要知道此图形原来的位置外,还需要知道()。
A.图形的形状、旋转中心B.图形的形状、旋转角C.旋转中心、旋转角D.以上答案都不对5.任意一对对应点与旋转中心所成的角都是()。
A.对应角B.旋转角C.直角D.钝角二.判断题(共5题,共10分)1.将三角形绕点o旋转90°后是。
()2.一条线段绕着它的一个端点旋转90°后,这条线段的位置发生了改变。
()3.小红在体育课上练习转向,向左转是顺时针方向,向右转是逆时针方向。
()4.将等边三角形绕着中心点旋转120°后,不能与原来的图形重合。
()5.奥运五环可以看做是一个圆经过旋转得到的。
()三.填空题(共5题,共21分)1.小船图先向()平移了()格,再向()平移了()格;也可说成小船图先向()平移了()格,再向()平移了()格。
2.在推导平面图形的面积公式时,用到平移或旋转的有________。
3.图形旋转的方向包括()时针和()时针。
4.这些现象哪些是"平移"现象,哪些是"旋转"现象:张叔叔在笔直的公路上开车,方向盘的运动是()现象。
升国旗时,国旗的升降运动是()现象。
妈妈用拖布擦地,是()现象。
自行车的车轮转了一圈又一圈是()现象。
5.梯形在平移前后,面积大小()变化,圆形经过轴对称的转换得到的图形,与原图相比大小()。
四.作图题(共3题,共18分)1.下面哪些图形是中心对称?把中心对称的图形圈起来。
人教版九年级上册化学第5单元测试题及答案

人教版九年级上册化学第5单元测试题及答案第五单元测试题(一)一、选择题(本大题包括12小题,每小题1分,共12分。
每小题的4个选项中只有1个符合题意)1.下列现象不能用质量守恒定律解释的是( )A .蜡烛燃烧时慢慢变短B .打开盛酒精的瓶盖,酒精的质量变小C .镁带燃烧后,固体的质量增加D .澄清石灰水露置在空气中,质量变大2.化学反应前后肯定没有发生变化的是( )①原子数目;②分子数目;③元素种类;④物质种类;⑤原子种类;⑥物质的总质量。
A .①④⑥B .①③⑤⑥C .①②⑥D .②③⑤3.下列化学方程式书写正确的是( )A .P +O 2=====点燃P 2O 5B .H 2O 2=====MnO 2H 2↑+O 2↑C .2H 2O=====通电2H 2↑+O 2↑D .Mg +O 2=====点燃MgO 24.从化学方程式4P +5O 2=====点燃2P 2O 5总结出的下列信息中,正确的是( )①反应条件是点燃②反应前后元素的种类不变③反应前后分子的总数不变④参加反应的物质是磷和氧气A .①②③B .①②④C .①③④D .②③④5.氮化硅是一种性能优异的无机非金属材料,可通过以下反应来制备:3SiO 2+6C +2X=====高温Si 3N 4+6CO ,此化学方程式中X 的化学式是( )A .N 2B .SiC .NOD .CO 26.在化学反应A 2+BC===B +A 2C 中,反应物BC 与生成物B 的质量关系如图所示。
若2 g A 2和80 g BC 恰好完全反应,则生成A 2C 的质量为( )A .64 gB .18 gC .80 gD .9 g7.在“2A +3B===2C +4D”的反应中,已知8 g 物质A 完全反应生成11 g 物质C和9 g 物质D 。
若A 的相对分子质量为32,则物质B 的相对分子质量是( )A .64B .48C .32D .608.为减少温室气体二氧化碳的排放,可以将二氧化碳进行转化。
人教部编版四年级语文上册第五六单元测试题含答案(统编版)

人教部编版四年级语文上册第五六单元测试题含答案(统编版)人教部编版四年级语文上册第五单元测试题时间:90分钟满分:100分得分:一、读拼音,写词语。
(8分)风筝(fēngzhēng)呼唤(hūhuàn)脱离(tuōfú)丧气(sàngqì)无奈(wúnài)牙齿(yáchǐ)眼睁睁(XXX)发呆(fādāi)二、给加点字选择正确的读音。
(6分)憧憬(chōngjǐng)田埂(gěng)歇息(xiēxi)拯救(zhěngjiù)嘶哑(sīyǎ)庞大(pángdà)三、我会选字填空。
(3分)稍微(shāowēi)捎(shāo)梢(shāo)拔草(bácǎo)动挺(dòngtǐng)幼儿(yòu'ér)梦想(mèngxiǎng)四、选词填空。
(5分)愿望希望失望1.我们精心做着,心中充满了无限憧憬和希望。
2.今年暑假爸爸没带我去动物园游玩,真让我失望。
3.他通过自己的不懈努力,终于实现了愿望。
猛烈热烈4.风猛烈地摇撼着路旁的白杨树。
5.会场响起了热烈的掌声。
五、把词语补充完整,再填写在适当的位置。
(8分)垂头丧气大惊失色呼唤无可奈何1.表示情绪低落的词语:垂头丧气。
2.写出类似含有数字的词语:三心二意、四面八方。
六、句子加工厂。
(7分)1.按要求完成句子练。
仿写句子:小狗从草丛中跑出来,像一团黑色的棉花球一样落在地上。
2.我们向那栋房子跑去,不停地寻找我们的“幸福鸟”……(修改病句)改为:我们向那座房子跑去,持续寻找我们的“幸福鸟”……3.“一种强大的力量使它飞了下来。
”这句话中“强大的力量”指的是(A)。
A.老麻雀对小麻雀的爱B.老麻雀比猎狗强大C.老麻雀胆子很大答案:C。
七、课文回顾。
(10分)1.《麻雀》主要讲了小麻雀勇敢、坚强的故事,赞扬小麻雀的勇气和毅力。
人教版数学五年级上册 第五单元 达标测试卷(含答案)

人教版数学五年级上册第五单元达标测试卷班级: 姓名: 学号:一、填空题。
(每空1分,共20分)1.一个正方形的周长是4a m,它的边长是 ( )m,面积是( )m2。
2.小丽买了5本笔记本,每本x元,付出了20元,应找回()元。
3.李叔叔每分钟骑v m,3分钟骑 ( )m,t分钟骑 ( )m。
如果每分钟行160 m,时间是20分钟,那么路程是 ( )m。
4.五(6)班有学生40名。
女生有(40-b)名,这里的b表示( )。
5.李明家9月的用水量是12 t,共交水费c元,那么水费平均每吨是 ( )元。
6.如果4a=b,根据等式的性质填一填。
4a+6=b( ) 4a×( )=b×84a-4=b( ) 4a ( )=b÷107.比x的5倍多11.2的数是( );a减去c的差的7倍是 ( )。
8.一本书有a页,张华每天看8页,看了b天,还剩 ( )页没有看。
当a=200,b=20 时,还剩 ( )页。
9.老王今年a岁,小李(a-28)岁。
再过c年后,他们相差( )岁,老王 ( )岁。
10.像这样摆下去,摆7个三角形一共需要 ( )根小棒。
像这样摆下去,摆n个正方形一共需要()根小棒。
二、判断题。
(对的画“√”,错的画“×”)(每题1分,共5分)11.2a与a·a都表示两个a相乘。
( )12. 50+2x>72,这是一个方程。
( )13. 等式的两边同时乘或除以一个数,左右两边仍然相等。
( )14. 0.32x= 0.9是方程。
( )15. ac-bc=(a-b)c。
( )三、选择题。
(将正确答案的序号填在括号里,共5分)16.方程10x=5的解是( )。
A.x=5B. x=0.5C. x=0.0517.下面的式子是方程的有( )。
A.48-xB.48-x<60C.48-2x=1218.与a相邻的两个数是 ( )。
A.9和11B.a-1和a+1C.a和a+119.一个长方形,长是20 m,宽是b m,它的周长是 ( ) m。
部编版三年级语文下册第5单元测试题含答案

部编版三年级语文下册第5单元测试题含答案第五单元测试题(一)时间:90分钟 满分:100分一、基础训练营(39分)1.读拼音,写词语。
(8分)2.给下面的汉字加上偏旁组成新字,再组词。
(6分)令⎩⎪⎨⎪⎧ ( ) ( ) 台⎩⎪⎨⎪⎧ ( ) ( ) 卖⎩⎪⎨⎪⎧() () 3.用“——”画出句中的错别字,并改正在括号里。
(3分)(1)小马虎经常惹磨烦,真让人胆心。
( )() (2)我变得树上长满了各种形壮的鸟窝。
( )() (3)小白兔发现了树干上不段往下滴的水朱。
( )() 4.在括号里填入合适的ABB 式的词语。
(3分)( )的饭菜 ( )的草地 ( )的大地( )的太阳 ( )的露珠 ( )的奖牌5.选词填空。
(4分)(1)李伟( )三年被评为“五好学生”,他是我们的好榜样。
(2)小娟做完了语文作业,又( )做数学作业,一分钟也不浪费。
(3)( )是晴天还是雨天,他( )要来训练场参加训练。
(4)( )下雨了,他( )不去参加训练了。
6.写出下列句子运用的修辞手法。
(4分)(1)风一吹,鸟窝就在枝头跳起了舞。
( )(2)青蛙在荷叶上歌唱,小鱼儿在荷叶下玩耍。
( )(3)盛开的牵牛花仿佛一个个小喇叭。
( )(4)星光在我身体里汩汩流淌,告诉我一个秘密。
( ) 7.照样子,发挥想象写句子。
(6分)(1)在宇宙的这一边,喷泉从水池里喷出,好似盛放的烟花;在宇宙的那一边,________________________________________________________________。
(2)大地万物加上一场大雪等于一片白茫茫。
_________________________________________________________________ (3)“早春二月”乘以“竹外桃花三两枝”,再乘以“春雨贵如油”,等于“春风又绿江南岸”。
_________________________________________________________________ _________________________________________________________________ 8.把下列句子按顺序排列。
部编版四年级下册语文试题第五单元综合测试卷(含答案)

第五单元测试卷时间:70分钟满分:100分一,读拼音,写词语。
(12分)fàn wéī càn làn zǐ sè()()()dù juān zhú sǔn yí dònɡ()()()二,选字填空。
(8分)臀臂壁僻( )静 ( )部墙( ) 手( )肩简箭剪( )单()刀( )膀火( )三,照样子,写词语。
(8分)1.示例:或浓或淡2.示例:蜿蜒——笔直扩大——漆黑——3.形容时间短暂的三字词语示例:一刹那四,按要求改句子。
(6分)1.这不是伟大的奇观吗?(改成陈述句)2.在水天相接的地方出现了一道红霞。
(改变语序,句子意思不变)五、按要求完成下列各题。
(15分)1.下面量词运用不恰当的一项是( )(3分)A.一簇鲜花一片浅蓝B.一道金边一条小溪C.一枝黄龙一架飞机D.一尊佛像一扇窗户2.对下列词语中加点字的解释有误的一项是( )(3分)A.颜色各异(不相同的)B.变化多端(项目,方面)C.伟大奇观(看到的景象)D.盘曲而上(像盘子那样的东西)3给下面的句子选择合适的关联词,正确的一项是( )(3分)这些石钟乳和石算,形状变化多端,再加上颜色各异( )不比作什么,( )很值得观赏。
A.即使…也B.因为…所以C.只要……就D.不但…而且4.下列句子不是比喻句的一项是( )(3分)A.太阳好像负着重荷似的一步一步,慢慢地努力上升。
B洞口像桥洞似的,很宽。
C.漓江的水真清澈,像一面镜子。
D.天渐渐破晓,大地朦朦胧的,如同笼罩着一层轻纱。
5.下列说法有误的一项是( )(3分)A.“我知道太阳要从天边升起来了,便不转眼地望着那里。
“不转眼”说明“我”注意力很集中地观察着太阳。
B.“这不是很伟大的奇观吗?”"这是一个反问句,表达的感情很强烈。
C.“4月14目,我在浙江金华,游北山的双龙洞。
”这句话点明了此次游览的时间人物和地点。
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Part 2 Vocabulary and Structure(Each item: 1)Directions:Choose the best answer from the four choice s marked A, B, C and D.11.Shall we request the chairman __________ our suggestion again?A. to considerB. consideringC. considerD. considered12.Some say yes and others say no; I don't know __________ to follow.A. whetherB. whatC. whomD. how13.An explosion is a sudden increase in amount __________.A. rapid burning causes itB. to be caused by rapid burningC. causing its burning to be rapidD. caused by rapid burning14.We forgave her anger because we knew that her father's illness had put her under great_________.A. shelterB. crisisC. stressD. nervousness15.He never _________ to read the news but turned at once to the crossword puzzle on the lastpage.A. worriedB. noticedC. painedD. bothered16.People appreciate _____________ with him because he has a good sense of humor.A. workingB. to have workedC. to workD. having worked17.Inquiries _____________ the condition of the patients may be made personally or bytelephone.A. revealingB. concerningC. affectingD. following18.Nobody knows how long and how seriously the shakiness of big businesses will _________down the economy.A. putB. settleC. dragD. knock19.I could not persuade him to accept it, _____________ make him see the importance of it.A. if only I could notB. or I could notC. not more than I couldD. nor could I20. __________ for my illness I would have lent him a helping hand.A. Not beingB. Without beingC. Had it not beenD. Not having beenPart 3 Cloze (with Options)(Each item: 1)Directions:Read the following passage carefully and choose the best answer from thechoice s.Questions 21 to 40 are based on the following passage."Mommy, do you love me?" asked Cleo during dinner that evening."Of course I do," Her mother replied 21.love me" usually 22."Then why don't you ever want to play with me?"Mrs. Nelson was a single mother trying to 23.worked fifty hours a week at a job and 24.home. This didn't 25.home. She was gone by 7 a.m. and back around 7 pm, just 26.late dinner for her and her daughter and 27.weekends, the house was usually so unclean that she spent most of her time 28.29.When she was finished with that, she hardly had any 30.Mrs. Nelson understood that she had not been giving her daughter the 31.time that she needed, but she didn't know 32.so 33.father for 34.daughter and give her some type of 35.36.bathroom to 37.daughter was still eating. Cleo looked 38.39."I'm sorry, Cleo," her mother said without further explanation. "How would you like to go to thezoo next Sunday?" Cleo's face 40.situation wasn't going to improve anytime soon, but feeling depressed in front of her daughter wasn't going to do anything to improve the situation.Part 4 Translation from English to Chinese(Each item: 1)Directions:Translate the following sentences from English to Chine se.41.We had to sleep in wet clothes, which was most uncomfortable.42.Whenever I met him, which was fairly often, I liked his sweet and hopeful smile.43.Rodger did not want to clean the room himself for he knew someone was bound to do it forhim.44.All right, you've made your point and there is no need to go on about it.45.Timothy is willing to spare some time to help though he has his hands full with his own work.Part 5 Reading Comprehension (Multiple Choice)(Each item: 1)Directions:Read the following passages carefully and choose the best answer from the four choice s marked A, B, C and D.Questions 46 to 50 are based on the same passage or dialog.In the United States, it is not normal to telephone someone very early in the morning. If you telephone him early in the day, while he is shaving or having breakfast, the time of the call shows that the matter is very important and requires immediate attention. The same meaning is attached to telephone calls made after 11:00 p. m. If someone receives a call during sleeping hours, he assumes it's a matter of life and death. The time chosen for the call communicates its importance.In social life, time plays a very important role. In the US guests tend to feel they are not highly regarded if the invitation (邀请) to a dinner party is extended only three or four days before the party date. But this is not true in all countries. In other areas of the world it may be considered foolish to make an appointment too far in advance because plans which are made for a date more than a week away tend to be forgotten.The meaning of time is different in different parts of the world. Thus, misunderstandings arise between people from cultures that treat time differently. To be on time is valued highly in American life, for example. If people are not on time, they may be regarded as not polite or not fullyresponsible. In the US no one would think of keeping a business associate waiting for an hour; it would be bad-mannered. A person who is five minutes late is expected to apologize. If he is less than five minutes late, he will say a few words of explanation, though perhaps he will not complete the sentence.46.If you telephone someone early in the day, it means ___________________.A. you are expected to explain whyB. you are not kind enoughC. you want to show your concern for himD. you have a very important matter to discuss47.The expression "a matter of life and death" means __________________.A. an issue of the greatest importance and emergencyB. a very important appointmentC. a matter of whether someone should live or dieD. a strong desire to communicate48.In the US guests tend to feel they are not highly regarded _______________.A. if the invitation to a dinner party is not extended early enoughB. if the invitation to a dinner party is extended too far in advanceC. if the invitation to a dinner party is not extended repeatedlyD. if the invitation to a dinner party is extended to too many people49.The word "misunderstanding" can be explained as ____________.A. failing to attend a partyB. failing to understand correctlyC. standing in one's wayD. standing on one's own feet50.Which of the following statements is NOT true according to the passage?A. In the US it's normal to keep someone waiting for some time.B. In the US it's not polite to keep someone waiting for an hour.C. In the US one is always expected to be on time.D. In the US one is expected to apologize if he is five minutes lateQuestions 51 to 55 are based on the same passage or dialog.Ours is a big world, and full of many different people. People with many varying (不同的) points of view are often running up against others who have different opinions. Those of us who smoke are just one group of many. Recently, the activism (采取行动) of non-smokers has reminded us of the need to be considerate (体谅的) of others when we smoke in public.But, please! Enough is enough! We should like to remind non-smokers that being polite is atwo-way street. If you politely request that someone not smoke you are more likely to receive an agreeable response than if you give an ugly look and say something unkind. If you speak directly to someone, you are more likely to get what you want than if you complain to the management.Many of us have been smoking for so long that we sometimes forget that others are not used to the smell of burning tobacco. We' re human, and like everyone else, we occasionally offend unknowingly. But most of us are open to friendly suggestions and comments, and quite willing to change our behavior to accommodate others.Smokers are people, too. We laugh and cry. We have hopes, dreams, and aspirations. We have children, mothers, and pets. We eat our hamburgers (汉堡包) with everything on them and give respect to the flag at Fourth of July picnics. We hope you'll remember that the next time a smoker light up in public.51.The purpose of the first paragraph is ______.A. to inform the reader of the bigness of the worldB. to declare that the author belongs to the group of smokersC. to tell non-smokers that smokers will be considerateD. to reveal the author's reason for writing this essay52.What does the second sentence in the second paragraph imply?A. We should go on two different roads.B. We have different ways of doing things.C. Being polite to each other is a mutual thing.D. We can smoke and sometimes we will not smoke.53.According to the author, how can you get an agreeable response from smokers if you don'tfeel like someone smoking beside you?A. Complain to his boss.B. Tell him directly that you hate smokers.C. Keep from complaining but do something to suggest your feelings.D. Tell him politely that you are not used to smoke.54.According to the author, why do some smokers smoke in public?A. Because they cannot stop from smoking.B. Because they forget that others do not like the smell cigarettes.C. Because they are humans and they cannot avoid offending people.D. Because there is no law against it.55.How does the author try to persuade the reader?A. He uses reasons.B. He appeals to people's feelings.C. He gives examples in his argument.D. He simply states his opinion.Questions 56 to 60 are based on the same passage or dialog.If you want to stay young, sit down and have a good think. This is the research finding of a team of Japanese doctors, who say that most of our brains are not getting enough exercise and as a result, we are aging unnecessarily soon.Professor Taiju Matsuzawa wanted to find out why otherwise healthy farmers in northern Japan appeared to be losing their ability to think and reason at a relatively early age, and how the process of aging could be slowed down.With a team of colleagues (同事) at Tokyo National University, he set about measuring brain activity of a thousand people of different ages and varying (不同的) jobs.Computer technology enabled the researchers to obtain precise measurements of the activity of the front and side sections of the brain, which relate to intelligence and feeling, and determine the human character. (The rear section of the brain, which controls functions like eating and breathing, does not change with age, and one can continue living without the ability to think and feel.)Change of front and side parts, as bits die off, was observed in some subjects in their thirties, but it was still not to be seen in some sixty-and-seventy-year-olds.Matsuzawa discovered from his tests that there is a simple answer to the loss normally associated with age?using the head.The findings show in general terms that the decrease of the brain's ability to think begins sooner in people in the country than in the towns. Those least at risk, says Matsuzawa, are lawyers, followed by university professors and doctors. White-collar workers doing routine work in government offices are, however, as likely to have shrinking brains as the farm worker, bus driver and shop assistant.Matsuzawa's findings show that thinking can prevent the brain from shrinking. Blood must move around properly in the head to supply the fresh oxygen the brain needs. "The best way to keep blood moving well is through using the brain." He says, "Think hard and engage in conversation. Don't rely on pocket calculators."56.The team of doctors wanted to find out _________________________.A. why certain people age sooner than othersB. how to make people live longerC. the size of certain people's brainsD. which people are most intelligent57.Which of the following statements is true?A. People who work in the government don't age as quickly as people in the town.B. The back of the brain is in charge of people's eating.C. The easiest way to prevent the brain from aging is to improve our diet.D. We are young when we have enough physical exercise.58.The doctor's tests show that _____________________________.A. our brains shrink as we grow olderB. the front section of the brain does not shrinkC. sixty-year-olds have better brains than thirty-year-oldsD. some people's brains less active than other people's59.According to the passage, which group of people seem to age sooner than the others?A. Lawyers.B. Professors.C. Doctors.D. White-collar workers.60.The article is possibly written for ________________________.A. junior studentsB. ordinary readersC. doctors and nurses in hospitalsD. university professors。