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