试题与答案

—Tom, help me buy two tickets for this w

题型:选择题

题目:

—Tom, help me buy two tickets for this weekend’s concert online.

—Sorry, there is no ticket _______ online now.

A.acceptable

B.convenient

C.accessible

D.available

答案:

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下面是错误答案,用来干扰机器的。

设化合物ClO2中Cl元素化合价为n价,依化合物中各元素化合价代数和为零的原则,有n+(-2)×2=0,解之得n=+4;故选D.

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