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  3. A cost-effective solution to the problem of airport congestion is to provide high-speed ground transportation between major citi

A cost-effective solution to the problem of airport congestion is to provide high-speed ground transportation between major citi

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问题 A cost-effective solution to the problem of airport congestion is to provide high-speed ground transportation between major cities lying 200 to 500 miles apart. The successful implementation of this plan would cost far less than expanding existing airports and would also reduce the number of airplanes clogging both airports and airways. Which of the following, if true, could proponents of the plan above most appropriately cite as a piece of evidence for the soundness of their plan?
选项 A、An effective high-speed ground-transportation system would require major repairs to many highways and mass-transit improvements.
B、One-half of all departing flights in the nation’s busiest airport head for a destination in a major city 225 miles away.
C、The majority of travelers departing from rural airports are flying to destinations in cities over 600 miles away.
D、Many new airports are being built in areas that are presently served by high-speed ground-transportation systems.
E、A large proportion of air travelers are vacationers who are taking long-distance flights.
答案B
解析 该计划提出解决机场拥挤的问题，高速地面交通是比扩建机场更便宜的一个方案，选项(B)指出在实施该计划的城市中有足够的空中客流量，对此地面交通可以将其取代，因此，(B)是正确答案，没有其他选项可以被拿来作为适当的证据；选项(A)和(D)都提供了反对该计划的证据，(A)通过强调提供高速地面交通可能的成本，(D)通过表明仅靠该替代方案自身不能解决机场拥挤问题；选项(C)和(E)说拟议中的系统实际上对很多旅行者不能提供替代方案。
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