5. 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 over-crowded 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.
6. Which of the following best completes the passage below?Established companies concentrate on defending what they already have. Consequently, they tend not to be innovative themselves and tend to underestimate the effects of the innovations of others. The clearest example of this defensive strategy is the fact that______
(A) ballpoint pens and soft-tip markers have eliminated the traditional market for fountain pens, clearing the way for the marketing of fountain pens as luxury or prestige items
(B) a highly successful automobile was introduced by the same company that had earlier introduced a model that had been a dismal failure
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