18．In our school library there      a number of books on science，and in these years the number of them     growing larger and larger．（　　）
A．are； isB．is； areC．have； areD．has； is

分析 在我們學(xué)校圖書館有許多關(guān)于科學(xué)的書，這些年它們的數(shù)量變得越來越大．

解答 答案A．
本題考查there be句型．首先，此句型中be動詞的單復(fù)數(shù)由離它最近的名詞來確定，其次a number of表示"若干的；許多的，后接復(fù)數(shù)可數(shù)名詞作主語時，其謂語動詞用復(fù)數(shù)形式；而the number of…表示"…的數(shù)量"．作主語的中心詞時，謂語動詞用單數(shù)形式．在本題中，第一個橫線根據(jù)a number of books on science，用復(fù)數(shù) are，第二個橫線根據(jù)the number of them用單數(shù) is，故本題選A．

點評 本題考查兩個知識點，首先是there be句型，其次是a number of和the number of 的意思的用法，要熟練掌握它們．

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