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    5．A ship in harbor is safe，but that's notwhatship are built for．

    分析 在港口的轮船是安全的，但是那不是造船的目的．

    解答 答案是what．本题考查语境中选用恰当的词；题干中是is后面的表语从句缺少的是for的宾语，what引导名词性从句在句中做主语、宾语或表语； 故答案是what．

    点评 本题考查单词填空，做此类题目时一定要仔细分析句子结构，根据所给词从语法、句意、时态等各方面判断所填词的正确形式．

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