Why does the author mention an elderly mouse in paragraph 2?
A. To describe the influence or old age on mice.
B. To illustrate the effect of meager food on mice.
C. To tell US how mice’s liver genes behave.
D. To inform. US of the process of metabolizing drugs.
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!