Question

Sharks are among the oldest animals on Earth. There are hundreds of kinds of sharks. Most are about two meters long. The dogfish shark, however, is less than twenty centimeters in length. A shark has an extremely good sense of smell. It can find small amounts of substances in water, such as blood, body liquids and chemicals produced by animals._ 1.__ Sharks eat fish, other sharks, and plants that live in the ocean.

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, overfishing of sharks is of special danger to the future of the animal.

Sharks are important for the world's oceans. They eat injured and diseased fish. Their hunting activities mean that the numbers of other fish in ocean waters do not become too great. __3.__

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.

Collectors pay thousands of dollars for the jaws of a shark. __4.__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, but some sharks are in danger of disappearing from Earth. __5.__

A. Shark liver oil is a popular source of Vitamin A.

B. This protects the plants and other forms of life that exist in the oceans.

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

D. These powerful senses help sharks find their food.

E. If too many sharks in one area are killed, that group of sharks may never return to normal population levels.

F. They are a threat to other forms of life in the ocean.

G. The others give birth to live young.

Answer 1

1.D

2.G

3.B

4.A

5.E

【解析】

试题分析：本文主要介绍了地球上最古老的生物—鲨鱼以及鲨鱼现在所面临的危险情况。

1.D 根据前面一句It can find small amounts of substances in water, such as blood, body liquids and chemicals produced by animals.可知鲨鱼很快就可以找到水里的雪，体液以及其他动物产生的化学物质。这样的能力让它们可以迅速找到食物。故D正确。

2.G 这两句是叙述鲨鱼的繁衍方式。根据前面一句About forty percent of all sharks lay eggs.可知百分之40的鲨鱼产卵，其余的鲨鱼直接生出小鲨鱼。故G正确。

3.B 根据前面一句Their hunting activities mean that the numbers of other fish in ocean waters do not become too great可知鲨鱼可以保持海洋的生态平衡，不让某些生物的数量太大。间接地保护了海洋里的其他生物。故B正确。

4.A 根据前后句Collectors pay thousands of dollars for the jaws of a shark和The skin of a shark can be used like leather.可知本段是在叙述鲨鱼肢体的作用，选项里只有A项与这两句类似。故A正确。

5.E 根据前面一句Sharks are among the oldest animals on Earth, but some sharks are in danger of disappearing from Earth.可知某些鲨鱼已经面临着灭绝的危险。那么一旦大量的鲨鱼被捕杀，那么这种鲨鱼很难恢复到正常的数量。呼吁我们保护鲨鱼。故E项符合上下文。

考点：科普类阅读表达