By using the national road system, one can drive to all states of America without stopping. It is believed that trucks using th

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问题 By using the national road system, one can drive to all states of America without stopping.
It is believed that trucks using the Interstate Highway System deliver more than ______ of all goods.

选项

答案75 percent

解析 本题涉及到Interstate Highway System中卡车运载的货物量,需锁定文章第二十一段。该段中的Experts believe that trucks using the system carry over seventy-five percent of all products that are sold即为出题点,很显然本题答案为75 percent。题干中的It is believed对应文中的Experts believe;more than对应文中的over;goods对应文中的products that are sold。
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