21．Zhu Zhiwen is ________ instant hit as a peasant singer, who is simple and honest by ________ nature.
A．an; the B．/; /
C．/; the D．an; /
答案：D 考查冠词。句意：生性单纯朴实的农民歌手——朱之文，瞬间引起了轰动。hit(演出)成功，为可数名词，其前又有instant修饰，故用冠词an；by nature固定短语，天生地，生性，故选D。
22． —Some Chinese students find it difficult to understand native speakers when in London.
—Exactly, ________they've learned a lot about grammar and known many words.
A．if only B．now that
C．as if D．even if
答案：D 考查连词的用法。句意：——有一些中国学生发现在伦敦很难听懂当地人讲话。——的确如此，即使他们已经学会了很多语法并且已知晓了很多单词。if only要是……就好了；now that既然；as if似乎，好像；even if即使，尽管，符合句意，故选D。
23． The little boy was ________ about everything—he stood there, observing the behavior of insects.
A．interested B．astonished
C．curious D．surprised
答案：C 考查形容词词义辨析。句意：那个小男孩对所有东西都感到好奇——他站在那里观察昆虫的行为。be interested in对……感兴趣；be astonished/surprised at/by对……感到惊讶； be curious about对……感到好奇，符合句意，故选C。
