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阅读短文，回答问题

话题	体裁	词数	难度	建议用时
动物保护	说明文	109	★★	5分钟

RIVER DOLPHIN RUNNING OUT OF TIME

The Yangtze dolphin is the only kind of dolphin that lives in freshwater all its life. Scientists say that the finless freshwater dolphin that has lived in the Yangtze River for over 20 million years, will die out in 15 years. It's in danger of disappearing forever.

Dangers:

■Dredging(挖掘) of their habitat

■Heavy boat traffic in the Yangtze River

■Insecticide(杀虫剂) and mercury(汞)

1. （1） How long has the Yangtze dolphin lived in the Yangtze River?

   A . For 20 million years. B . For less than 20 million years. C . For more than 20 million years. D . For about 20 million years.
3. （2） What is NOT a danger to the Yangtze dolphin?

   A . Dredging the river bed. B . Boats in the river. C . Insecticide and mercury. D . Swimmers.
5. （3） How heavy is an adult Yangtze dolphin?

   A . 30 kg. B . 45 kg. C . 30 kg～45 kg. D . 75 kg.
7. （4） What does the Yangtze dolphin mainly eat?

   A . Fish and shrimp. B . Fish. C . Shrimp. D . Grass.
9. （5） In the first picture, the underlined word “finless” means _______ in Chinese.

   A . 有鳍的 B . 无鳍的 C . 温顺的 D . 好看的