_____ of the water _____ polluted. We must try to protect our environment.

A．Two third; areB．Two third; is
C．Two thirds; areD．Two thirds; is

D

解析試題分析：句意：三分之二的水杯污染了。我們必須盡力保護(hù)我們的環(huán)境。分?jǐn)?shù)的表達(dá)方法：分子基數(shù)詞，分母序數(shù)詞，分子大于一，分母加s。water是不可數(shù)名詞，謂語(yǔ)動(dòng)詞要用單數(shù)。故選D。
考點(diǎn)：考查分?jǐn)?shù)的用法。

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