单项选择题

A．The woman feels sorry for the man.
B．The man is a member of the staff.
C．The area is for passengers only.
D．The woman is asking the man to leave.
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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
单项选择题
A．They could drive the insects away.B．They could keep the plants well-watered.C．They could build devices to trap insects.D．They could make the plants grow faster.
A．They could drive the insects away.
B．They could keep the plants well-watered.
C．They could build devices to trap insects.
D．They could make the plants grow faster.
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