单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage ,you will be given 20 seconds to answer the questions.
Now listen to the passage.
In which point some sharks are similar with humans

A．Bone structure.
B．Smell ability.
C．Birth mode.
D．Recover ability against diseas

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单项选择题

单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage ,you will be given 20 seconds to answer the questions. Now listen to the passage. In which point some sharks are similar with humans 您的浏览器不支持 audio 元素。