超星 - Lesson 12 短听力选择

单选题

Directions: in this part, you are going to listen to five transmissions or short exchangesand choose the correct answer from four choices.

A. right
B. left
C. south
D. north

单选题

depressurize 释压

A. To preform the smoke emergency procedures
B. To make an emergency descent
C. To make an immediate descent
D. To make a rapid descent for ventilation

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单选题

actuators 作动筒

A. loss of electrical power
B. flight control surface malfunction
C. long holding en route
D. engine failure

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