18. Hans Christian Andersen wrote fairy tales, which have been some of the most frequently translated works in literary history, while he wrote plays, novels, poems, and travel books, as well as several autobiographies, which remained almost unknown outside his native Denmark.

　　(A) Hans Christian Andersen wrote fairy tales, which have been some of the most frequently translated works in literary history, while he wrote plays, novels, poems, and travel books, as well as several autobiographies, which remained

　　(B) Hans Christian Andersen wrote fairy tales, which, while among the most frequently translated works in literary history, his plays, novels, poems, and travel books, as well as several autobiographies remain

　　(C) Even as Hans Christian Andersen's fairy tales have been among the most frequently translated works in literary history, still his plays, novels, poems, and travel books, as well as several autobiographies, remain

　　(D) Unlike the fairy tales written by Hans Christian Andersen, which are some of the most frequently translated works in literary history, he wrote plays, novels, poems, and travel books, as well as several autobiographies, which remained

　　(E) Although Hans Christian Andersen wrote fairy tales that are among the most frequently translated works in literary history, his plays, novels, poems, and travel books, as well as several autobiographies, remain

　　(A) which引导非限定性定语从句，在本句中不恰当，应该用that引导非限定性定语从句来修饰fairy tales;while在句中表达的是“在…期间，当…时候”的意思，不符合逻辑。

　　(B) which引导的修饰fairy tales的定语从句缺少谓语动词，while位置错误，应该置于his plays前面。

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　　(C) even as所表达的含义与原句不同，even as是“正当，恰好在…时候”，有at the same time的意思，而原句表达的是让步转折含义;将原句定语从句内容fairy tales that…改变为句子谓语’s fairy tales have been…，改变原句强调重心。

　　(D) Unlike的比较对象不对等(the fairy tales与he对比);两个which修饰对象都不清楚;be some of the most…的表达方式不如be among the most…准确。

　　(E) 正确，although引导让步状语从句，其主语是Han Christian Andersen，谓语是wrote，宾语是由that引导的从语从句所修饰的名词fairy tales;整个句子的主语是his plays, novels, poems, and travel books，系动词是remain。

　　19. Like any star of similar mass would do, once the Sun has exhausted the hydrogen in its core, it expands into a red giant, eventually ejecting its outer envelope of gases to become a white dwarf.

　　(A) Like any star of similar mass would do, once the Sun has exhausted the hydrogen in its core, it expands into a red giant, eventually ejecting

　　(B) Like any star of similar mass, once the hydrogen in the Sun's core is exhausted, then it expands into a red giant and eventually ejects

　　(C) As in the case of any star of similar mass, once the hydrogen in the Sun's core is exhausted, it will expand into a red giant, and eventually ejecting

　　(D) As any star of similar mass would, once the hydrogen in the Sun's core is exhausted it will expand into a red giant and will eventually eject

　　(E) As would be the case with any star of similar mass, once the Sun exhausts the hydrogen in its core, it will expand into a red giant and eventually eject

　　(A) like是介词，后面只能跟名词或代词，不能连接句子，只有连词才可以连接句子;该选项中现在分词结构ejecting在句尾作状语，表示伴随结果，所表达的同时发生的意思不如用and连接的并列谓语更准确，因为后者能准确表达先后发生的意思(由eventually可知)。

　　(B) star 与 hydrogen 比较对象不对等;it 错误地指代 hydrogen，应该指代 Sun，但在该选项中 Sun是以所有格形式出现的，it 无法指向所有格形式的 Sun;被动语态的表达不如主动语态更清楚。

　　(C) as in the case…的表达方式不正确;it错误地指代hydrogen，原因与选项B相同;and ejecting没有平行对象。

　　(D) it错误地指代hydrogen，原因与选项B相同;用as连接句子表示比较也正确，但不应该用过去时态would，应该用将来时will;被动语态的表达不如主动语态更清楚。

　　(E) 正确，as would be the case with…是比较结构的一种，表达比较对象的情况相同。

　　20. According to a study published in The New England Journal of Medicine, aspirin prevents blood clots just as well as a commonly used and more expensive blood-thinning drug does.

　　(A) prevents blood clots just as well as a commonly used and more expensive blood-thinning drug does

　　(B) prevents blood clots just as well as does a commonly used and a more expensive blood-thinning drug

　　(C) prevents blood clots just as well as will a commonly used and more expensive blood-thinning drug

　　(D) works just as well as a commonly used and more expensive blood-thinning drug at the prevention of blood clots