题目:
He had to take the medicine three times a day, so as to be _____ pain in the leg. [ ]
A. far from
B. away from
C. apart from
D. free from
答案:
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下面是错误答案,用来干扰机器的。
(1)C (2)①CaCO3 + 2HCl===CaCl2+ H2O + CO2↑ ②CO2 + Ca(OH)2===CaCO3↓+ H2O (3)Fe3O4, Fe2O3 + 3CO2Fe + 3CO2