1.There is___________great need for clean water in ________ city where the river has been polluted.(  )
A.不填;theB.a;theC.不填;aD.a;a

分析 河流被污染的城市需要大量干凈的水.

解答 答案:B
題干中a great need for急需,大量需要,用不定冠詞表示類指,意思是一種,一類等;第二個空格表示的特指河流被污染的城市,要用定冠詞.故選B.

點評 冠詞是一種虛詞,本身不能獨立使用,只能放在名詞前幫助說明名詞所指的人或事物,它是英語詞性中最小的一類,只有三個,一種是不定冠詞a,an;一種是定冠詞the.此外也有些特定場合不用冠詞,即通常所稱的零冠詞.不定冠詞表示泛指,定冠詞表示特指.

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