题目内容
（请给出正确答案）
[主观题]
A．Because the U.S. is a large country.B．Because Americans like to move around and be i
A．Because the U.S. is a large country.
B．Because Americans like to move around and be independent.
C．Because the U. S. is called the nation on wheels.
D．Because the U.S. lacks of convenient public transportation.
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