题目:
The teacher agreed to the suggestion that the students _________ two weeks to prepare for the exam without coming to school.
A.give
B.should give
C.be given
D.would be given
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:某元素R的原子核外最外层电子数为5,则R是第ⅤA族元素。因此R的常见化合价有+3价、+5价,所以选项③⑤⑥⑦⑧均是正确的。①②中R的化合价分别是+1价和+2价,不符合,答案选B。点评:该题是...