the river becomes ()because the paper factory pours waste water into it九下英语作业本

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the river becomes ()because the paper factory pours waste water into it九下英语作业本
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the river becomes ()because the paper factory pours waste water into it九下英语作业本
the river becomes ()because the paper factory pours waste water into it
九下英语作业本

the river becomes ()because the paper factory pours waste water into it九下英语作业本
The river becomes polluted because the paper factory pours waste water into it.

dirty(脏兮兮,不干净的)

the river becomes (contaminated) because the paper factory pours waste water into it.
河水被污染,因为造纸厂把废水倒进河里。