根據(jù)短文內(nèi)容，從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。

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, 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 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． This is a threat to other forms of life in the ocean.

G．The others give birth to live young.

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Summer Science Class registration begins on March 8 ! If you are interested in science，the environment，or conservation and you are in grades 7－12，sign up soon for Black Rock Forest Consortium's Summer Science Class program. You can download the Summer Science Classes 2013 brochure here. It is easy to register；just call 845?534?4517 or click here.

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Black Rock Forest Consortium is a nonprofit organization founded in 1989 to advance scientific understanding of the natural world through research，education and conservation programs.

1.If you want to be a member of Summer Science Class，you should ________．

A．visit Black Rock Forest first

B．download their brochure

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根據(jù)短文內(nèi)容，從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。

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A

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