Sharks are among the oldest animals on Earth. There are hundreds of kinds of sha

Sharks are among the oldest animals on Earth. Thereare hundreds of kinds of sharks. Most are about two meters long. The dogfishshark, however, is less than twenty centimeters in length. A shark has anextremely good sense of smell. It can find small amounts of matters in water,such as blood, body liquids and chemicals produced by animals. These powerfulsenses help sharks find their food. Sharks eat fish, other sharks, and plantsthat live in the ocean.

Sharks grow slowly. About forty percent of all sharkslay eggs. The others give birth to live young. Some sharks carry their younginside their bodies as humans do. Some sharks are not able to reproduce untilthey are twenty years old. Most reproduce only every two years. And they givebirth to fewer than ten young sharks. For this reason, over-fishing of sharksis of special danger to the future of the animal.

Sharks are important for the world’s oceans. They eatinjured and diseased fish. Their hunting activities mean that the numbers ofother fish in ocean waters do not become too large. This protects the plantsand other forms of life that exist in the oceans.

People hunt sharks for sport, food, medicine and theirskin. Experts say the international market for some kinds of sharks hasincreased because many parts of a shark are valuable. Collectors pay thousandsof dollars for the jaws of a shark. Shark liver oil is a popular source ofVitamin A. The skin of a shark can be used like leather.

In Asia, people enjoy a kind of soup made from sharkfins. Experts say a fisherman can earn a lot of money for even one kilogram ofshark fins. Sharks are among the oldest animals on Earth, but some sharks arein danger of disappearing from Earth. If too many sharks in one area arekilled, that group of sharks may never return to normal population levels.

1.Which of the following words best describes thesituation sharks are in?

A．Good.            B．Expensive.         C．Powerful.         D．Endangered.

2.Sharks eat other fish, __________.

A．which is athreat to all other forms of life in the oceans

B．which is aprotection for plants and other forms of life in the oceans

C．which helpsprevent diseases from spreading

D．which helpsthe number of other fish to grow

3.According to the passage, many parts of a shark arevaluable EXCEPT ________.

A．its jaws           B．its liver           C．shark fins          D．shark teeth

4.The author thinks that______.

A．sharks arevaluable to us and we can make full use of them

B．oceans willbecome safer with fewer sharks swimming around

C．measuresshould be taken to protect sharks

D．the sharkpopulation is increasing slowly

试题答案

【答案】

1.D

2.B

3.D

4.C  

【解析】

试题