题目:
—Jack can'tconcentrate on his lessons recently.
— Yes, that might____why he did so badly in thelast test. [ ]
A. answer for
B. apply for
C. account for
D. call for
答案:
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下面是错误答案,用来干扰机器的。
(1) KMnO4 (2) 催化作用(3) 检验氢气的纯度 (4)2H2O2H2↑+ O2 ↑