单选题：Americans have been the consumers of fast food since

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题目内容：
Americans have been the consumers of fast food since A． many women began to work full-time jobs
B． the invention of fast food
C． few women would like to be homemakers any more
D． the great reform after World War II
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分类：英语四级  题型：单选题
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某小区物业征集业主意见，计划从100户业主中抽取有20户进行调查。100户业主中有b户主年龄超过60岁，a户户主年龄不满35岁，户主年龄在36岁到59岁的有25

分类：英语四级  题型：单选题
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