单项选择题

Questions 17—20 are based on the following passage. You now have 20 seconds to read Questions 17—20. What"s the main topic of this passage

A．It"s about the tests of a new airliner before its flying.
B．It"s about how to protect a new airliner.
C．It"s about how to train a new pilot.
D．It"s about what the airliner engineers should do.

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单项选择题

What must you make sure when you load the cassette

A．That you open the recorder.
B．That you get the power supply.
C．That you get the right side of the tape facing you.
D．That you switch the recorder on.

Questions 17—20 are based on the following passage. You now have 20 seconds to read Questions 17—20. What"s the main topic of this passage 您的浏览器不支持 audio 元素。

Questions 17—20 are based on the following passage. You now have 20 seconds to read Questions 17—20. What"s the main topic of this passage