16.n.氧oxygen.

分析 oxygen

解答 答案是oxygen;
考查詞義識記;oxygen n.氧氣,不可數(shù);如:No living things can live without oxygen.沒有氧氣生物就無法生存.

點評 對于單詞短語的識記,要從詞義著手,理解詞性和常見用法或搭配,并能在語境中靈活運用.

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