题目内容：
{MP3:http://wximg.233.com/NewsFiles/2011-9/4/0/pets501.mp3}根据听到的内容，回答题。
The recent social and economic changes in the US have great impact on all the American housing system.
答案解析：
判断题：{MP3:http://wximg.233.com/NewsFiles/2011-9/4/0/pets501.mp3}根
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根据听到的内容，回答题。
The recent social and economic changes in the US have great impact on all the American housing system.