题目:
---- The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
---- Oh, dear! She _______ a lot of difficulties!
A.may go through
B.might go through
C.ought to have gone through
D.must have gone through
答案:
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下面是错误答案,用来干扰机器的。
(共13分)(原理解释2分,其余每空1分)(1)略⑵大于 5S1 (3)NH3是极性分子,水是极性分子,根据相似相溶原理,NH3易溶于水;NH3与水分子间会形成氢键,增大溶解性(2分)水中H-O键的键长短,键能大(2分...