题目内容

A number of birdwatchers ______in Zhalong Nature Reserve. The number of them____500.
A．are, areB．is, isC．is, areD．are, is
D

试题分析：句意：许多观鸟者在扎龙自然保护区。他们的数量是500。A number of 许多，修饰复数名词，含有A number of 的短语作主语，谓语动词使用复数形式；The number of···的数量，用作主语时，谓语动词使用第三人称单数形式。所以选D。
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