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10．The water is very serious in the lake now，so the government must prevent people from it．（　　）

	A．	pollution；polluting		B．	pollution；to pollute
	C．	pollution；pollution		D．	pollute；pollution

分析水污染已經相當嚴重了，所以政府必須阻止人們繼續污染水源．

解答答案：A，考察動詞和名詞辨析．在前面一句，缺少主語，所以不應該用動詞pollute，而應該用名詞pollution來表示"水污染"，所以排除選項D．在后面一句話中，用到了固定短語"prevent sb from doing sth"，譯為"阻止某人做某事"，所以應該填寫動詞ing形式，因此選擇A．

點評考察名詞或動詞的詞形變化，應根據上下文及給定的動詞或名詞形式進行適當變換

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