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单选题
What is the “R. V.’s” used for in for the retired Americans?
A
they are used as home when they are out.
B
they are short form of recreational vehicles.
C
they are the only home for the travelers.
D
they are just transportation tools.
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参考解析
解析：
根据题干关键词可定位至第二段，该段明确指出“These serve as a home away from home”，即这种游艺车被当作一个移动的家，类似我们知道的“房车”。其它表述有误。
根据题干关键词可定位至第二段，该段明确指出“These serve as a home away from home”，即这种游艺车被当作一个移动的家，类似我们知道的“房车”。其它表述有误。
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