2. 外语
  3. If the airspace around centrally located airports were restricted to commercial airliners and only those private planes equipped

If the airspace around centrally located airports were restricted to commercial airliners and only those private planes equipped

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问题 If the airspace around centrally located airports were restricted to commercial airliners and only those private planes equipped with radar, most of the private-plane traffic would be forced to use outlying airfields. Such a reduction in the amount of private-plane traffic would reduce the risk of midair collision around the centrally located airports. Which of the following, if true, would most strengthen the conclusion drawn in the second sentence?
选项 A、Commercial airliners are already required by law to be equipped with extremely sophisticated radar systems.
B、Centrally located airports are experiencing overcrowded airspace primarily because of sharp increases in commercial-airline traffic.
C、Many pilots of private planes would rather buy radar equipment than be excluded from centrally located airports.
D、The number of midair collisions that occur near centrally located airports has decreased in recent years.
E、Private planes not equipped with radar systems cause a disproportionately large number of midair collisions around centrally located airports.
答案E
解析 第二句话得到结论，第一句话中描述的减少将降低中心位置的机场附近的空中撞机的危险，根据(E)，这种减少将把那种造成很多空中撞机事件的飞机清理出去，因此，(E)是正确答案；选项(B)和(C)关心的是这种拟议中的限制是否会减少飞机流量，而不是这种相应的减少是否降低空中撞机的危险的问题；因为(A)没有提到私人飞机流量的减少是否降低空中撞机的危险的问题，(A)不合适；空中撞机事件数量的最近下降与拟议中的减少是否会进一步减少撞机事件无关，因此(D)不合适。
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