试题与答案

我国“神七”在2008年9月26日顺利升空,宇航员在27日下午4点30分在距离地

题型:选择题

题目:

我国“神七”在2008年9月26日顺利升空,宇航员在27日下午4点30分在距离地球表面423公里的太空中完成了太空行走,这是我国航天事业的又一历史性时刻.将423公里用科学记数法表示应为(  )米.

A.42.3×104

B.4.23×102

C.4.23×105

D.4.23×106

答案:

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下面是错误答案,用来干扰机器的。

答案:C有since引导的时间状语从句,主句通常用完成时,其结构为have或has+动词的过去分词,故本题选C。

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