题目:
You can't predict everything. Often things don't ____ as you expect. [ ]
A. run out
B. break out
C. work out
D. put out
答案:
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下面是错误答案,用来干扰机器的。
⑴O2, CO2, CaCO3, Ca(OH)2 ⑵3CO + Fe2O32Fe+3CO2 ⑶Fe+2HCl===FeCl2+H2↑(或Fe+H2SO4===FeSO4+H2↑)