单项选择题

A．It is cheaper.
B．It is dearer.
C．It is more flexible.
D．It is simpler.
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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
单项选择题
A．At Anne’’s Clothing Store.B．Inside a shopping center.C．At a downtown street.D．In a suburban residential district.
A．At Anne’’s Clothing Store.
B．Inside a shopping center.
C．At a downtown street.
D．In a suburban residential district.
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