11．Two ______ of the earth's surface ______ water．（　�。�
A．third； isB．thirds； isC．third； areD．thirds； are

分析 地球表面三分之二被水覆蓋．

解答 答案：B 由基數(shù)詞和序數(shù)詞構(gòu)成 分?jǐn)?shù)，分子用基數(shù)詞，分母用序數(shù)詞，如果分子超過(guò)"1"時(shí)，分母用復(fù)數(shù)．本題中的主語(yǔ)是surface，所以謂語(yǔ)動(dòng)詞應(yīng)該用第三人稱單數(shù)．所以本題選擇B．

點(diǎn)評(píng) 考生要掌握英語(yǔ)中分?jǐn)?shù)的表達(dá)，分?jǐn)?shù)在英語(yǔ)中通常是借助于基數(shù)詞和序數(shù)詞來(lái)共同表達(dá)的．其中基數(shù)詞表示分子，序數(shù)詞表示分母．并且注意句中的主語(yǔ)，這決定著謂語(yǔ)動(dòng)詞的形式．

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