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

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 matters in water, such as blood, body liquids and chemicals produced by animals. These powerful senses help sharks find their food. Sharks eat fish, other sharks, and plants that live in the ocean.
Sharks grow slowly. About forty percent of all sharks lay eggs. The others give birth to live young. 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.
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 large. 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. Collectors pay thousands of dollars for the jaws of a shark. Shark liver oil is a popular source of Vitamin A. 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. If too many sharks in one area are killed, that group of sharks may never return to normal population levels.
【小题1】Which of the following words best describes the situation sharks are in?A．Good.B．Expensive.C．Powerful.D．Endangered.【小题2】Sharks eat other fish, .A．which is a threat to all other forms of life in the oceansB．which is a protection for plants and other forms of life in the oceansC．which helps prevent diseases from spreadingD．which helps the number of other fish to grow【小题3】According to the passage, many parts of a shark are valuable EXCEPT .A．its jawsB．its liverC．shark finsD．shark teeth【小题4】The author thinks that .A．sharks are valuable to us and we can make full use of themB．oceans will become safer with fewer sharks swimming aroundC．measures should be taken to protect sharksD．the shark population is increasing slowlyD

(答案→)D 解析：本文主要介绍了有关鲨鱼的一些情况。鲨鱼的嗅觉很灵敏，鲨鱼哺育孩子的方法，鲨鱼对于海洋的重要性，人们为了利益捕杀鲨鱼，鲨鱼的现状很危险。【小题1】细节题：从最后一段的句子：but some sharks are in danger of disappearing from Earth. 可知鲨鱼处于危险的地步 ，选D【小题2】推理题：从第三段的句子：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 large.可知鲨鱼在海洋中很重要，它吃掉受伤和有病的鱼，这维持着海洋生物链的平衡。选B【小题3】细节题：从倒数第二段的内容Collectors pay thousands of dollars for the jaws of a shark. Shark liver oil is a popular source of Vitamin A. The skin of a shark can be used like leather.可知D想不对。【小题4】推理题：从最后一段的句子：If too many sharks in one area are killed, that group of sharks may never return to normal population levels.可知要采取措施保护鲨鱼了。选 C

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