We cannot existwithout air.food and water．题目和参考答案——青夏教育精英家教网—

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20．We cannot existwithout air，food and water．

分析我们离开空气、食物和水就不能生存．

解答答案是exist．本题考查语境中选用恰当的词或短语的适当形式．exist vi．存在；情态动词后接动词原形；故根据句意答案是exist．

点评首字母填空必须在对语境整体理解的基础上抓住指向答案的关键线索、固定句型或搭配等，结合首字母选用恰当的词，同时注意所选词的形式变化．

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