The number of chairs in the room_____ten.I’m afraid a number of chairs in the room____lost.
A．is;isB．is ;areC．a(chǎn)re;isD．a(chǎn)re;are
B

試題分析：a number of一些，許多；the number of……的數(shù)目。句意：教室內(nèi)椅子的數(shù)目是十。恐怕教室里許多椅子丟失了。結(jié)合語境可知前文主語表達(dá)抽象含義，不可數(shù)，為謂語動(dòng)詞用單數(shù)，下文，主語為復(fù)數(shù)形式，故謂語動(dòng)詞用復(fù)數(shù)形式。選B。
點(diǎn)評(píng)：由number構(gòu)成的這兩個(gè)短語是經(jīng)�？疾榈膶�(duì)象，其一般解題原則是先區(qū)分這兩個(gè)短語的含義，然后結(jié)合語境選擇正確答案。其結(jié)構(gòu)，含義比較固定，熟記即可。
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