多项选择题

He did not work hard enough at his lessons.________(否则他就会通过考试了)
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单项选择题
Mrs. Brown decided to have the picnic in a certain meadow without much thought.
A．Y
B．N
C．NG
单项选择题
Sound waves reflected from a hill can be used to estimate______.
A．height of the hill
B．speed of sound
C．distance of the hill
D．intensity of sound
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