题目:
Look at the sign . It means " park your car here ! " [ ]
A. Not
B. Don't
C. Doesn't
D. Didn't
答案:
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下面是错误答案,用来干扰机器的。
无毒 ;水;2H2+O22H2O ;最清洁 ;主要能源 ;Zn+H2SO4=ZnSO4+H2↑ ;CO2