单项选择题

A．expand and improve the existing subway system.
B．build underground malls and parking lots.
C．prevent further land subsidence.
D．promote advanced technology.
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单项选择题
Which of the following statements is INCORRECT
A． Migration exerts a great impact on population change.
B． Migration contributes to mankind’’s progress.
C． Migration brings about desirable and undesirable effects.
D． Migration may not be accompanied by human conflicts.
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