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Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. Which group of mice is the healthiest among the 3 groups after 3 years

A．The first group.
B．The second group.
C．The last group.
D．All the 3 groups.

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Olympic gymnastics medals are usually won by men between the ages of

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. Which group of mice is the healthiest among the 3 groups after 3 years 您的浏览器不支持 audio 元素。