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完形填空
The students were having their chemistry(化学)class．Miss Li was telling the children 1 water was like．After that, she asked her students,“What's water?” 2 spoke for a few minutes．Miss Li asked again,“Why don't you answer my question?Didn't you 3 me carefully just now?”
Just then a boy 4 his hand and said,“Miss Li, you tell us that water has no color and no smell．But where to 5 such kind of water?The water in the river behind my house is always black and it has a 6 smell．”Most of the children agreed 7 him．The boy went on saying：“My family and neighbors are 8 about the water．We wonder when and how we can stop the factories from 9 the river．”
“I'm sorry, children．”said the teacher,“Our water is getting 10 ．That is what we should talk about next．”
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