5. With more and more forests destroyed,huge quantities of good soil           at present. (wash)

隨著越來越多的森林被砍伐掉了，目前有大量的優(yōu)質(zhì)土壤正在被沖走。

5. are being washed away考查句子時態(tài)的用法。句子中有時間狀語at present,因此要用現(xiàn)在進行時；土壤是被沖走，因此要用被動語態(tài)；huge / large quantities of后面不論接的是可數(shù)還是不可數(shù)名詞，謂語動詞一律用復數(shù)形式。

題目來源：高考丟分題英語 > Unit 4 Global warming

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