【解析】21.C　本文叙述了作者的丈夫到悉尼，装有重要文件的箱子被偷掉了。在他万般无奈的情况下，有人主动联系他，并归还他丢失的重要文件。这些重要的文件在别人看来都不重要，但是对于丈夫来说却是万分重要。选项中的C项能够说明文章的中心思想。故C正确。

　　(三)错误选项的特点 1．无中生有或断章取义。即在短文中没有提到或有的选项中的某些词语取自文章中，但经过推敲之后你会发现这类选项的内容与文章的内容不相符合。

　　【例】(2017广东)While Jennifer was at home taking an online exam for her business law class, a monitor(监控器)a few hundred miles away was watching her every move. … In the battle against cheating, this is the cutting edge

　　and a key to encourage honesty in the booming field of online education.The technology gives trust to the entire system, to the institution and to online education in general.Only with solid measures against cheating, experts say, can Internet universities show that their exams and diplomas are valid—that students haven't just searched the Internet to get the right answers.

　　Although online classes have existed for more than a decade, the concern over cheating has become sharper in the last year with the growth of “open online courses.” …while also taking steps to help guarantee honesty at a distance. …

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