【段3】①Last year, the Transportation Security Administration (TSA) found in a secret check that undercover investigators were able to sneak weapons—both fake and real—past airport security nearly every time they tried. ②Enhanced security measures since then, combined with a rise in airline travel due to the improving economy and low oil prices, have resulted in long waits at major airports such as Chicago’s O’Hare International. ③It is not yet clear how much more effective airline security has become—but the lines are obvious.
22.Which of the following contributes to long waits at major airports?
[A]New restrictions on carry-on bags.
[B]The declining efficiency of the TSA.
[C]An increase in the number of travelers.
[D]Frequent unexpected secret checks.
答案：C
问：22题C选项对应原文中的什么内容？
A : more effective airline security
B : a rise in airline travel
C : the improving economy
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