2018高中英语北师大版版必修3练习：Unit 7(一) Warm-up & Lesson 1— Pre reading Word版含解析

课时跟踪练(一) Warm-up & Lesson 1— Pre-readingⅠ.阅读理解AAbout 97% of the world's water is salty and is found in our oceans and seas. But, as we can't drink seawater, how can it be important?Every part of our seas and oceans contains an amazing number of animals and fish that live at different ocean depths. Most of the different species of animals and fish depend on simple plants for their food. These simple plants called algae (海藻) drift near the surface of the ocean and use sunlight to turn carbon dioxide and water into food and oxygen. In fact, algae produce over half of the oxygen people breathe. How important seawater is!Each plant or animal in our seas and oceans is an importantlink in a food chain. The algae are eaten in large amounts bymicroscopic animals, which are in turn consumed by larger animals.These food chains are delicately balanced.The bad news about the food chains in the oceans is that theyare under threat because of man. People once thought that the oceans were so big that it didn't matter if we dumped rubbish into them or caught huge quantities of fish and whales for food. But we now know this is not true, and fish stocks in the oceans have started to drop.Thankfully, the world is taking steps to protect the future of our oceans by introducing international agreements to protect marine habitats. Most countries have introduced fishing restrictions to protect fish stocks in the oceans, and new techniques are being pioneered to cope with pollution. Finally, the importance of protecting oceans is being made known to more people. This is just the beginning of a long process to protect the oceans for our future. We depend on the oceans for fish which are an important part of the human diet. How important seawater is!语篇解读：本文主要阐述了海水的重要性。

1．Which of the following is the proper order of the food chain?A．small animals→algae→microscopic animals→large animals→manB．algae→microscopic animals→large animals→larger animals→manC．small animals→algae→large animals→microscopic animals→manD．microscopic animals→algae→large animals →larger animals→man解析：选B细节理解题。

根据第二、三段内容可知答案。

2．From the passage, we learn that________.A．most fish and sea animals live at the surface of the seasB．it is very difficult to break the balance of a food chainC．excessive fishing has caused the decrease in fish stockD．it won't be long before the problems concerning oceans will be solved解析：选C推理判断题。

根据第四段中的“... fish stocks in the oceans have started to drop”可知大量捕捉鱼类肯定会造成鱼类储量的下降；根据第二段首句可知选项A不正确；根据第三段中的“These food chains are delicately balanced.”可知选项B不正确；根据最后一段中的“This is just the beginning of a long process to protect the oceans for our future.”可知选项D 不正确。

3．Which of the following is NOT a way being used to protect oceans?A．The use of international agreements.B．Forbidding fishing to protect fish stocks.C．The use of new techniques.D．Raising people's awareness of the need to protect oceans.解析：选B细节理解题。

根据最后一段可知很多国家通过限制捕鱼数量来保护鱼类，但不是禁止捕鱼；其他几种措施在最后一段中都可找到。

4．What would be the best title of the passage?A．The importance of seawaterB．Life in the oceansC．How to protect food chainsD．How to deal with seawater pollution解析：选A标题归纳题。

根据文章的第一段，以及第二段和最后一段的末句可知文章的中心是在说明海水的重要性。

BEarly in the 16th century men were trying to reach Asia by traveling west from Europe. In order to find Asia they had to find a way past South America. The man who eventually found the way from the Atlantic Ocean to the Pacific was Ferdinand Magellan.Magellan sailed from Seville in September 1519 with five shipsand about 266 men. Thirteen months later, after spending a severewinter on the coast of Patagonia, he discovered the channel which isnow called Magellan's Strait. In November 1520, after many monthsof dangers from rocks and storms, during which two ships were lost,the three remaining ships entered the ocean on the other side of South America.They then continued, hoping to reach Asia. But they did not see any land until they reached the islands off the coast of Asia. Before they arrived at these islands, later known as the Philippines, his men were dying of starvation. While they were staying in the Philippines, Magellan was killed in battle. The remaining officers then had to get back to Spain. They decided to sail round Africa. After many difficulties, one ship with eighteen men sailed into Seville three years after leaving. They were all that remained of Magellan's expedition. However, their achievement was great. They were the first men to sail round the world.。