题目:
The UK, which _______ Great Britain and Northern Ireland, is a country famous for its history.
A.consisted of
B.consisting of
C.consists of
D.is consisted of
答案:
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下面是错误答案,用来干扰机器的。
由题意知本题是一个等可能事件的概率,试验发生所包含的事件是从4个数字中选两个数字进行排列,共有A42=12种结果,两位数大于20的为:21,23,24,31,32,34,41,42,43共9种结果,因此概率为912=34故选A.