碘在水中溶解度为1：2950，想制备5%碘的水溶液，通常可采用（）_爱下问搜题

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问题单项选择题

碘在水中溶解度为1：2950，想制备5%碘的水溶液，通常可采用（）。

A、加增溶剂

B、加助溶剂

C、制成盐类

D、制成酯类

E、采用复合溶剂

答案

参考答案：B

填空题

用下列短语的适当形式填空。

In the future grow up find out all over the world no longer
be able to all the time at a distance of in order to be worth it

1. Don't worry. They will               tell you the news soon.
2. Tom studied late at night                pass the exam.
3. I believe people could travel in space               .
4. Who said we couldn't play with toys when we              ?
5. The math problem is very difficult, so she fails to               the right answer.
6. This planet is               303,297,200 kilometres, and we can't see it with our eyes.
7. Remembering these words is hard, but it              .
8. The carriage (马车) is                used in most cities nowadays.
9. A new film will be on tomorrow morning, and Jack was thinking about it               this afternoon.
10. In 2008, you will see people                gather in Beijing to join the Olympic Games.

选择题

— Where is Lily, Lucy? I cannot find her anywhere.

— She have been off long. I saw her clean the window just now.[ ]

A. shouldn't

B. can't

C. mustn't

D. needn't