单项选择题

(Sound waves) travel (in the air) in much (the same) way (like) water waves spread on the water.

A．Sound waves
B．in the air
C．the same
D．like
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单项选择题
The lecturer made (too a long) speech, so every listener (felt tired of) him, and (some even went) out of the lecture hall (without getting) the permission from the speaker.
A．too a long
B．felt tired of
C．some even went
D．without getting
单项选择题
It is (raining hard) outside. (Haven' t) you (taken) an umbrella (with you)
A．raining hard
B．Haven' t
C．taken
D．with you
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