题目内容

There is a river around our town. It is about ______ long.
A．6 hundreds kilometersB．6 hundred kilometers
C．6 hundreds kilometerD．6 hundred kilometer
B
考查数词的用法。句意“这条河环绕着我们镇，大约有600Km长。”当hundred前有具体数字时，不用复数，排除A、C；kilometer“千米”，在此应该用复数，排除D。故选B。
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