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

Sharks grow slowly. About forty percent of the different kinds of 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 the ocean 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 greatly 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 shark may never return to normal population levels

A. The others give birth to live young.

B. Sharks are important for the health of the world's oceans.

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

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

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

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

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

 

【答案】

 

1.G

2.A

3.B

4.D

5.F

【解析】

試題分析：考察說(shuō)明文。本文介紹了鯊魚的有關(guān)信息，如鯊魚的飲食，繁衍以及鯊魚所處的現(xiàn)狀。警告人們要注意保護(hù)鯊魚，因?yàn)楹芏圊忯~都處于滅絕的危險(xiǎn)之中。

1. G 前一句These powerful senses help them find their food.講述的是鯊魚敏銳的感覺可以幫助他們尋找到食物。接下來(lái)的這句就應(yīng)該介紹鯊魚的食物具體是什么。故G項(xiàng)符合上下文語(yǔ)境。

2.A 前句About forty percent of the different kinds of sharks lay eggs說(shuō)明講述的是鯊魚不同的繁衍方式。有的是產(chǎn)卵，有的是直接分娩出小鯊魚。故A項(xiàng)內(nèi)容符合上下文。

3.B 根據(jù)本段最后一句This protects the plants and other forms of life that exist in the oceans.可知鯊魚可以保護(hù)海洋里其他的一項(xiàng)生物，說(shuō)明本段講述的是鯊魚的重要性。故B項(xiàng)內(nèi)容符合語(yǔ)境。

4.D 根據(jù)下句Shark liver oil is a popular source of Vitamin. The skin of a shark can be used like leather. 可知本段內(nèi)容講述的是鯊魚的器官在市場(chǎng)上收到追捧。故D項(xiàng)與上下文是吻合的。

5.F 推理題。根據(jù)下句If too many sharks in one area are killed, the group of shark may never return to normal population levels可知現(xiàn)在很多鯊魚都處于滅絕的危險(xiǎn)之中，如果我們?cè)俨槐Ｗo(hù)鯊魚，也許有一天它們就會(huì)消失。故F項(xiàng)符合上下文。

考點(diǎn)：考察說(shuō)明文

 

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