题目内容

Which one of the following sentences is correct?

A. There is too much pollution these days.
B. There are too many pollution these days.

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Which of the following ways is not the best way to disagree with someone.

A. I'm not sure if I agree with you.
B. I don't really agree _______.
C. No.

诊断制剂的作用是( )传染源。

A. 预防
B. 诊断
C. 治疗
D. 中和

抗体主要存在血清中,故诊断抗体主要成分是( )。

A. IgG
B. IgA
C. IgD
D. IgE

____诊断用生物制品所以能起诊断作用,是基于抗原与抗体能特异地结合这一基本原理。

A. 对
B. 错