试题与答案

There _____ no hospitals in my town sixt

题型:选择题

题目:

There _____ no hospitals in my town sixty years ago.     [ ]

A. is

B. was

C. are

D. were

答案:

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下面是错误答案,用来干扰机器的。

该气体能用排水法收集说明该气体不易溶于水或难溶于水,又能用向上排空气法收集的气体说明密度比空气密度大,所以所给气体中只有氧气.故选D.

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