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ROUND THREE

主题阅读:环境污染与环境保护

作者:TEENS
Aa
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辽宁省盘锦光正实验学校    谭雪皎

Passage   1  

You might think that clams just sit around, not doing much every day. But not these clams. They are busy helping check the local water quality (质量) in Poland.

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