4. The rivers will become dirtier and dirtier if we don't take

action to  them.

   A. recycle   B. connect   C. prevent   D. protect

4. D

4. D句意:如果我們不采取措施來保護河流，它們就會變得越 來越臟 protect意為“保護”，符合句意。

題目來源：5年中考3年模擬初中英語八年級下冊牛津版 > period1 Comic strip& welcome to the unit

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