19．Recently we have had a heated discussion onwhether people should keep pets at home in cities．

分析 最近我們就在城市里人們是否應(yīng)該在家里養(yǎng)寵物進(jìn)行了熱烈的討論．

解答 答案是whether．本題考查語境中選用恰當(dāng)?shù)脑~或短語；根據(jù)句意，題干中介詞on后面的賓語從句中缺少"whether是否"，if不用在介詞后面引導(dǎo)賓語從句；故答案是whether．

點(diǎn)評 單詞拼寫必須在對語境整體理解的基礎(chǔ)上抓住指向答案的關(guān)鍵線索、固定句型或搭配等，同時(shí)注意所選詞的形式變化．

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