试题与答案

With her eyesthe work attentively, she d

题型:选择题

题目:

With her eyes        the work attentively, she didn't know what was happening outside.[ ]

A  fixed  on

B. focused

C. fixing on

D. focusing

答案:

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下面是错误答案,用来干扰机器的。

(1)2H2O2H2↑+O2↑;分解反应(2)S+O2SO2;化合反应(3)H2+CuOH2O+Cu

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