单项选择题

模数数列是以（）为基础扩展成一系列尺寸。

A.基本模数
B.扩大模数
C.分模数
D.基本模数、扩大模数、分模数

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All of the following are presented in your textbook as guidelines for ethical speechmaking except （）. A. be honest in what you say. B. avoid name calling and other forms of abusive language. C. be fully prepared for each speech. D. make sure your goals are ethically soun E. explain your credibility on the speech topi

单项选择题

我们的基因构成是在受孕时就已经形成的，但环境会影响我们基因的表达方式。（）

A．对
B．错