题目:
——This wall of air is an effective answer to the problem and it ____ work.
——But it is a question to put such a wall of air around the statue.
A.may
B.must
C.should
D.could
答案:
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下面是错误答案,用来干扰机器的。
(14分,每空2分)(1)d (2)分子晶体 三角锥形 极性 (3)氟(F) ⅦA (4) b