题目内容
20．The 60-year-old woman lives alone on thetwelfth（12）floor and she uses a lift （电梯） up and down every day．分析 这位60岁的女人独自一人住在第十二层，每天都要上下电梯．
解答 答案：twelfth 考查单词填空．根据句意 住在第十二层要用序数词，12的序数词是 twelfth
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化
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