Question

【题目】七选五

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

体裁	话题	词数	难度	建议时间
说明文	鲨鱼的习性及其对维持海洋生态平衡的重要性	249	★★☆☆☆	5分钟

Sharks have lived in the world’s oceans for millions of years. A shark has a very good sense of smell. It can find small amounts of substances in water, such as blood, body liquids and chemicals produced by animals. These powerful senses help sharks find their food. 1

Sharks grow slowly. About forty percent of all sharks lay eggs. 2 Some sharks carry their young inside their bodies as humans do. Some sharks are not able to reproduce until they are twenty years old. Most reproduce only every two years. And they give birth to fewer than ten young sharks. For this reason, over-fishing of sharks is of special danger to the future of the animal.

3 They eat injured and diseased fish. Their hunting activities mean that the numbers of other fish in ocean waters do not become too great. This protects the plants and other forms of life that exist in the oceans.

People hunt sharks for sport, food, medicine and their skin. Experts say the international market for some kinds of sharks has increased because many parts of a shark are valuable. 4 Shark liver oil is a popular source of Vitamin. The skin of a shark can be used like leather. In Asia, people enjoy a kind of soup made from shark fins. Experts say a fisherman can earn a lot of money for even one kilogram of shark fins.

Sharks are among the oldest animals on Earth. 5 If too many sharks in one area are killed, the group of sharks may never return to normal population levels.

A. The others give birth to their young.

B. Sharks are important for the world’s oceans.

C. This is a threat to other forms of life in the ocean.

D. Collectors pay thousands of dollars for the jaws of a shark.

E. But some sharks are in danger of disappearing from Earth.

F. Sharks are valuable to us and we can make full use of them.

G. Sharks eat fish, other sharks, and plants that live in the ocean.

Answer 1

【答案】

【1】G

【2】A

【3】B

【4】D

【5】E

【解析】

【语篇解读】本文是一篇说明文，介绍了鲨鱼的习性及对维持海洋生态平衡的重要性，并警告人们鲨鱼现在已处于濒临灭绝的境地。

【1】 根据本空前的＂These powerful senses help sharks find their food. ＂可知，此处承接上文，讲的是鲨鱼的食物来源，故G项正确。

【2】 根据本空前的＂About forty percent of all sharks lay eggs.＂及本空后的＂Some sharks carry their young inside their bodies as humans do.＂可知，此处讲的是鲨鱼的繁衍方式——有的卵生，有的胎生，故A项正确。

【3】 根据本空后的＂This protects the plants and other forms of life that exist in the oceans. ＂可知，鲨鱼能够维持海洋的生态平衡，故B项正确。

【4】 根据本空后的＂Shark liver oil is a popular source of Vitamin. The skin of a shark can be used like leather. In Asia, people enjoy a kind of soup made from shark fins.＂可知，鲨鱼的器官、皮在市场上非常受欢迎，故D项符合语境。

【5】 根据本空后的＂If too many sharks in one area are killed, the group of sharks may never return to normal population levels.＂可知，此处是说现在很多鲨鱼都濒临灭绝，故E项正确。