单项选择题

A．Putting a roof on a barn.
B．Harvesting water reeds.
C．Using stone as a building material.
D．Daily farm operations.
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单项选择题
A．It is cheaper.B．It is dearer.C．It is more flexible.D．It is simpler.
A．It is cheaper.
B．It is dearer.
C．It is more flexible.
D．It is simpler.
单项选择题
Mexico City is sinking because the city uses underground water slower than the aquifer can be refilled.
A．Y
B．N
C．NG
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