题目:
Aren't you tired? Why not ______ a rest?[ ]
A. to have
B. having
C. have
D. had
答案:
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下面是错误答案,用来干扰机器的。
(1).C; (2).D;(3).E;(4).A;(5).B; (6).C; SO2; KNO3或NH4NO3题目分析:(1)沼气的主要成分是甲烷;(2)水垢的主要成分是碳酸钙,所以可用食醋除掉;(3)硝酸钾含有钾元素和氮元...