The rivers will become dirtier and dirtier ______ we take action to protect them.

A. since B. if

C. until D. unless

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書面表達(dá)

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1．了解一些緊急救護的電話和方法

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3．清楚告訴對方發(fā)生的事情和地點

4．保持冷靜，等待救援。

注意：

1．詞數(shù)：80詞左右；開頭已給出，不計入總詞數(shù)；

2．應(yīng)覆蓋所有要點：可適當(dāng)增加細(xì)節(jié)，使行文連貫；

3．參考詞匯：emergency services緊急救護 operator（接線員）

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