OG-37. 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 sue 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?
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 f 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.
怎么也想不明白为什么选E, 求大家指点！ | 
