lesson 21 短听力：听一遍录音，选择最佳答案。
A. It will turn left to resume its own navigation .
B. It will resume its own navigation after left turn.
C. It will offset its path to encounter CBs.
D. It is expected to meet CBs on its original route.
lesson 21 短听力：听一遍录音，选择最佳答案。
A. Forbidden area
B. Helicopter training area
C. Thunderstorm area
D. Permitted area
lesson 21 短听力：听一遍录音，选择最佳答案。
A. 20 degrees right
B. due to weather
C. due to traffic
D. 30 degrees left
lesson 21 短听力：听一遍录音，选择最佳答案。
A. Due to turbulence and icing.
B. Due to moderate turbulence.
C. Due to weight.
Due to spacing.
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