老师在讲授“分子和原子”内容时做了如图所示实验。请问：（1）该实验的目的是什么？（2）B烧杯的作用是什么？
It would be a good idea to use a plastic bottle, cut off, as a container to grow young plants in.
The good news we were looking forward in the end.
David is such a good boy all the teachers like.
A man with a bleeding hand hurried in an asked, “Is there a hospital around I can get some medicine for my wounded hand?”
It was what he meant rather than what he said annoyed me.
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