The number of private cars in urban areas should be limited ___________the number of public buses should be increased.
A．whenB．while C．unlessD．until
B

試題分析：考查連詞：A. when當(dāng)…時(shí)候B. while 當(dāng)…時(shí)候，然而C. unless除非D. until直到，句意：都市的私家車數(shù)量應(yīng)該減少而公共汽車的數(shù)量應(yīng)該增加。選B。
點(diǎn)評(píng)：連詞的詞義辨析要放在上下文的語(yǔ)境中進(jìn)行，要注意上下文的語(yǔ)義的串聯(lián)以及邏輯關(guān)系的推理，特別要注意一些連詞和時(shí)間狀語(yǔ)的固定搭配。While是近幾年高考�？嫉倪B詞，因?yàn)閣hile的含義比較多，考生平時(shí)要多關(guān)注while的用法。
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