16．The reptiles produced young generally by laying eggs．

分析 爬行動物通過下蛋來產(chǎn)仔．

解答 laying；lay是一個動詞，意為"產(chǎn)卵"，從前面produce young可推知，這里要表達下蛋（lay egg），by是介詞，后面應(yīng)該加動詞ing形式，故填laying．

點評 考查動詞的詞義，在熟記單詞詞義的基礎(chǔ)上還要聯(lián)系語境，從而寫出正確答案，寫動詞時還要注意其人稱、時態(tài)和語態(tài)的變化．

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