－You’re dropped __________ “s” in the word “across”.
－Oh, you are right, __________ letter “s” should be doubled like this “cross”.

A．a(chǎn), aB．a(chǎn)n, aC．a(chǎn)n, theD．the, a

C

解析試題分析：句意:在單詞”across”當(dāng)中,你丟了一個(gè)”s”.——哦，你說的對。想這個(gè)“cross”一樣，這個(gè)字母“s”應(yīng)該雙寫。結(jié)合語境可知上文泛指任何一個(gè)字母“s”故用不定冠詞，s詞首音素是元音，故不定冠詞用an。下文特指某個(gè)字母，故用定冠詞，選C。
考點(diǎn)：冠詞
點(diǎn)評：冠詞是一種虛詞，一般用于名詞前面表示特指或者泛指某一個(gè)。冠詞的應(yīng)用都用一定規(guī)則，熟記這些規(guī)則是解題的關(guān)鍵。不定冠詞用在名詞前，表示泛指任何一個(gè)。定冠詞用在名詞前表示特指某一個(gè)。在專有名詞及表示泛指的復(fù)數(shù)名詞前一般不要冠詞，叫做零冠詞。需注意的是不定冠詞的用法是看詞首音素，不是看首字母，如：useful首字母是元音，但是詞首音素時(shí)輔音，故不定冠詞用a；hour首字母是輔音，但是詞首音素是元音，故用冠詞an。

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