Sharks have lived in the world's oceans for millions of years. A shark has an extremely go

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. 【小题1】
Sharks grow slowly. About forty percent of the different kinds of sharks lay eggs. 【小题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.
【小题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. 【小题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. 【小题5】 If too many sharks in one area are killed, the group of shark may never return to normal population levelsA．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 oceanG

(答案→)G 解析：考察说明文。本文介绍了鲨鱼的有关信息，如鲨鱼的饮食，繁衍以及鲨鱼所处的现状。警告人们要注意保护鲨鱼，因为很多鲨鱼都处于灭绝的危险之中。【小题1】 G 前一句These powerful senses help them find their food.讲述的是鲨鱼敏锐的感觉可以帮助他们寻找到食物。接下来的这句就应该介绍鲨鱼的食物具体是什么。故G项符合上下文语境。【小题2】A 前句About forty percent of the different kinds of sharks lay eggs说明讲述的是鲨鱼不同的繁衍方式。有的是产卵，有的是直接分娩出小鲨鱼。故A项内容符合上下文。【小题3】B 根据本段最后一句This protects the plants and other forms of life that exist in the oceans.可知鲨鱼可以保护海洋里其他的一项生物，说明本段讲述的是鲨鱼的重要性。故B项内容符合语境。【小题4】D 根据下句Shark liver oil is a popular source of Vitamin. The skin of a shark can be used like leather. 可知本段内容讲述的是鲨鱼的器官在市场上收到追捧。故D项与上下文是吻合的。【小题5】F 推理题。根据下句If too many sharks in one area are killed, the group of shark may never return to normal population levels可知现在很多鲨鱼都处于灭绝的危险之中，如果我们再不保护鲨鱼，也许有一天它们就会消失。故F项符合上下文。

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