专四

单选题

According to the passage, the average age of the fleet of Delta/Northwest is
[A] 10 years. 
[B] 14 years. 
[C] 16 years. 
[D] 20 years.

参考答案：C进入在线模考


细节题。文中提到“It found American and Delta／Northwest had the oldest fleets，at about l6 years on average．”因此答案为[c]。

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