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】

試題分析：本文主要介紹了地球上最古老的生物—鯊魚以及鯊魚現(xiàn)在所面臨的危險(xiǎn)情況。

1.D 根據(jù)前面一句It can find small amounts of substances in water, such as blood, body liquids and chemicals produced by animals.可知鯊魚很快就可以找到水里的雪，體液以及其他動(dòng)物產(chǎn)生的化學(xué)物質(zhì)。這樣的能力讓它們可以迅速找到食物。故D正確。

2.G 這兩句是敘述鯊魚的繁衍方式。根據(jù)前面一句About forty percent of all sharks lay eggs.可知百分之40的鯊魚產(chǎn)卵，其余的鯊魚直接生出小鯊魚。故G正確。

3.B 根據(jù)前面一句Their hunting activities mean that the numbers of other fish in ocean waters do not become too great可知鯊魚可以保持海洋的生態(tài)平衡，不讓某些生物的數(shù)量太大。間接地保護(hù)了海洋里的其他生物。故B正確。

4.A 根據(jù)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.可知本段是在敘述鯊魚肢體的作用，選項(xiàng)里只有A項(xiàng)與這兩句類似。故A正確。

5.E 根據(jù)前面一句Sharks are among the oldest animals on Earth, but some sharks are in danger of disappearing from Earth.可知某些鯊魚已經(jīng)面臨著滅絕的危險(xiǎn)。那么一旦大量的鯊魚被捕殺，那么這種鯊魚很難恢復(fù)到正常的數(shù)量。呼吁我們保護(hù)鯊魚。故E項(xiàng)符合上下文。

考點(diǎn)：科普類閱讀表達(dá)