单项选择题

Questions 17—20 are based on the following passage about the tests of airliner before it goes into service You now have 20 seconds to read Questions 17—20. Why air must be pumped into the plane

A．Because without air the plane can’t fly.
B．Because the plane needs air for its fuel.
C．Because the passengers’ lives depend on air.
D．Because the passengers have paid for it.

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单项选择题

What can we infer from the passage

A．Plants have more characteristics than animals.
B．Animals have more characteristics than plants.
C．Plants and animals are different in several ways.
D．Plants and animals are less powerful than human beings.

单项选择题

What may the red thing do besides recording

A．Wipe off the sound on the tape.
B．Play the recorder.
C．Set the recorder work.
D．Stop the recorder.

Questions 17—20 are based on the following passage about the tests of airliner before it goes into service You now have 20 seconds to read Questions 17—20. Why air must be pumped into the plane 您的浏览器不支持 audio 元素。

Questions 17—20 are based on the following passage about the tests of airliner before it goes into service You now have 20 seconds to read Questions 17—20. Why air must be pumped into the plane