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

分析 在港口的輪船是安全的，但是那不是造船的目的．

解答 答案是what．本題考查語境中選用恰當?shù)脑~；題干中是is后面的表語從句缺少的是for的賓語，what引導名詞性從句在句中做主語、賓語或表語； 故答案是what．

點評 本題考查單詞填空，做此類題目時一定要仔細分析句子結(jié)構(gòu)，根據(jù)所給詞從語法、句意、時態(tài)等各方面判斷所填詞的正確形式．

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