－You’re dropped __________ “s” in the word “across”.
－Oh, you are right, __________ letter “s” should be doubled like this “cross”.
A．a, a B．an, a C．an, the D．the, a
C
【解析】
試題分析：句意:在單詞”across”當中,你丟了一個”s”.——哦，你說的對。想這個“cross”一樣，這個字母“s”應該雙寫。結合語境可知上文泛指任何一個字母“s”故用不定冠詞，s詞首音素是元音，故不定冠詞用an。下文特指某個字母，故用定冠詞，選C。
考點：冠詞
點評：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。冠詞的應用都用一定規則，熟記這些規則是解題的關鍵。不定冠詞用在名詞前，表示泛指任何一個。定冠詞用在名詞前表示特指某一個。在專有名詞及表示泛指的復數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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A．Dr. Bonilla-Warford thinks using computers causes nearsightedness. |
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B．People keep their eyes protected against drying by blinking normally. |
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C．Children under two can watch TV for less than two hours a day. |
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D．Dr. David Hunter says headache causes an increase in eye problems. |
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C．Using Digital Devices: Advantages and Disadvantages |
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D．How Much Screen Time Is Too Much for Children |
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