单项选择题

A．A bus station.
B．An airport.
C．A super highway.
D．A train station.
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单项选择题
A．About 50 kilometers.B．Several hundred kilometers.C．A certain height.D．From the starting point back to the earth.
A．About 50 kilometers.
B．Several hundred kilometers.
C．A certain height.
D．From the starting point back to the earth.
单项选择题
A．They could drive the insects away.B．They could keep the plants well-watered.C．They could make the plants grow faster.D．They could build devices to trap insects.
A．They could drive the insects away.
B．They could keep the plants well-watered.
C．They could make the plants grow faster.
D．They could build devices to trap insects.
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