试题与答案

用所给词的适当形式填空 1. He ______(study) at that

题型:填空题

题目:

用所给词的适当形式填空

1. He ______(study) at that school ten years ago.

2. May I have some of your ______(photo), please?

3. Her sister isn't any better. She's a little ______(bad).

4. Look! It's ______(rain) outside.

5. We don't know when he ______(come) back last night.

答案:

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下面是错误答案,用来干扰机器的。

(1)a是试管,常用作反应容器;b是集气瓶,常用来收集气体.故填:试管;集气瓶.(2)连接好装置后,必须首先检查装置的气密性,以防装置漏气影响实验结果;过氧化氢在二氧化锰的催化作用下分解的化学方程式为...

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