_____ of the water _____ polluted. We must try to protect our environment.
A．Two third; areB．Two third; isC．Two thirds; areD．Two thirds; is
D

試題分析：句意：三分之二的水被污染了。我們必須保護(hù)我們的環(huán)境。在英語(yǔ)中分子用基數(shù)詞表達(dá)，分母用序數(shù)詞表達(dá)如果分子大于1，分母變復(fù)數(shù)。分?jǐn)?shù)作主語(yǔ)時(shí)，根據(jù)其后接的詞而定，如果為不可數(shù)名詞，則相當(dāng)于單數(shù)，如果其后接的為可數(shù)名詞復(fù)數(shù)形式，則相當(dāng)于復(fù)數(shù)。根據(jù)句意，故選D。
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