The U．S．built many roads because__________．

A．many people began to use Cars

B．the countryside developed quickly

C．more roadside restaurants were needed

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句意：美国修建许多公路是因为__________。细节题。从文章第二段第二句“With SO many people taking to the road，the U．S．had to build more and better roads to support all that traffic．”可知．由于公路上的汽车越来越多，导致交通问题，所以美国修建更多的公路，故选项A符合题意。

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