题目内容

frivolous means being careful. ()

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I cannot understand him behave so foolishly. ()

犬瘟热免疫后()天开始产生中和抗体。

A. 6天
B. 20天
C. 30天
D. 1天

A test is an official document that authoritatively determines the content and principles of teaching and learning. ()

That she answered the question correctly pleased him enormously. ()