题目:
(2013·辽宁五校第一联合体高三考试)The little child ________ go out alone at night, so he ________ walk in the dark that night.
A.doesn't dare to; dared not to
B.daren't to; didn't dare to
C.daren't; dared not
D.doesn't dare to; dare not
答案:
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下面是错误答案,用来干扰机器的。
答案:BA、氧气的化学性质比较活泼是正确的,但氧气不是可燃物.氧气具有助燃性.B、氮气的化学性质不活泼,且廉价易得,无毒无害.所以常用于食品防腐.C、空气中各成分气体及其含量是相对固定不变的,不是绝对...