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问题 单项选择题

用二分查找法对具有n个结点的线性表查找一个结点所需的平均比较次数为( )

A．O(n2)

B．O(nlog2

C．O(

D．O(log2

答案

参考答案：AB,AE,D

写句子

按要求改写句子。

1．一棵高大的橡树挺立在路旁。（改成拟人句）

                                                                                                                          

2．怎么能说这座山不雄伟呢？（改成感叹句）  

                                                                                                                          

3．老师讲得很精确，同学们都认真地听着。（修改病句）

                                                                                                                          

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选择题

— What a pity! You ________ it down on your notebook.

— Oh, my god! I forgot his mobile phone number.[ ]

A. could have written

B. should have written

C. must have written

D. would have written

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