Section BDirections: In this section, you will hear 3 short passages. At the end of each p
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
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A.It carries its own oxygen supply.
B.It does not need any oxygen during the flight.
C.It can produce oxygen during the flight.
D.It extract oxygen from the air that flows through the engine.