--Which is more useful, chemistry or biology? --I think them are useful. [ ] A．none of B．all of C．either of D．both of 题目和参考答案——青夏教育精英家教网—

题目内容

--Which is more useful, chemistry or biology?

--I think _____ them are useful.

[　　]

A．none of	B．all of
C．either of	D．both of

答案：D
解析：

考查代词的用法，句中chemistry和biology是两门学科。两者之间用both表达，下句意为“我认为它们都有用”。故选D。

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