C。动词短语go through表示“经历……”。

　　D。

　　A。用介词for+宾语表示“为人们做事”，故选A。

　　C。know about表示“了解”，侧重于有关某人或某事的具体情况。

　　A。learn后面接的是一个宾语从句，而且连接词在从句中做learn 的宾语，所以只能用what，因为that在宾语从句中是纯连词，只能起连接作用，不能做句子成分。

　　D。think of表示“想起；认为”；think about表示“考虑”；think out表示“想出”；根据文章含义，答案应是D。

　　C。介词as表示“作为”，为正确选项。

　　A 篇

　　The Queen’s English is now sounding less upper-class, a scientific study of the Queen’s Christmas broadcasts had found. Researchers have studied each of her messages to the Commonwealth countries since 1952 to find out the change in her pronunciation from the noble Upper Received to the Standard Received.

　　Jonathan Harrington, a professor at Germany’s University of Munich, wanted to discover whether accent (口音) changers recorded over the past half century would take place within one person. “As far as I know, there just is nobody else for whom there is this sort of broadcast records,” he said.

　　He said the noble way of pronouncing vowels (元音) had gradually lost ground as the noble upper-class accent over the past years. “Her accent sounds slightly less noble than it did 50 years ago. But these are very, very small and slow changes that we don’t notice from year to year.”

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