题目内容
20．I need to go to the library，and if I post the letter on the way，I'll be killing two birds withone （first） stone．分析 我需要去图书馆，如果我在路上寄信的话，我就能一举两得（一石二鸟/一箭双雕）．
解答 答案：one
根据句子意思"去图书馆的路上寄信"，可知作者想引用成语："一石二鸟"，字面意思是："用一块石头打中两只鸟"，故应该填写表示数量的基数词one．
点评 本题主要考查序数词与基数词之间的转换，只要认真分析句义，就不难判断出答案．
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