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【简答题】
Questions 13 to 15 are based on the conversation you have just heard. 13-15.mp3: 13. A) Bad weather. B) Human error. C) Breakdown cet6w.com. D) Failure of the communications system. 14. A) Two thousand feet. B) Twelve thousand feet. C) Twenty thousand feet. D) Twenty-two thousand feet. 15. A) Accurate communication is of utmost importance. B) Pilots should be able to speak several foreign languages. C) Air controllers should keep a close watch on the weather. D) Cooperation between pilots and air controllers is essential.
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A.
（1）和（2）都不正确。
B.
仅（1）正确。
C.
仅（2）正确。
D.
（1）和（2）都正确。
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A.
can…couldn’t
B.
are able to…weren’t able to
C.
must…needn’t
D.
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