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Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. According to the passage, what animals are often used by scientists to learn about man

A．Mice.
B．Rats.
C．Monkeys.
D．All of the above.

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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. According to the passage, what animals are often used by scientists to learn about man 您的浏览器不支持 audio 元素。