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Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. In which point some sharks are similar with humans

A．Bone structure.
B．Smell ability.
C．Birth mode.
D．Recovery ability against disease.

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单项选择题

单项选择题

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. In which point some sharks are similar with humans 您的浏览器不支持 audio 元素。