单项选择题

We can safely say that rent control ______.

A．will always benefit those who rent apartments
B．proves to be of vital importance to the low-income groups
C．will bring negative effects in the long run
D．is necessary especially in protecting those unemployed

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单项选择题

The passage tells us ______.

A．the relationship between supply and demand
B．the possible results of government controls
C．the necessity of government control
D．the urgency of getting rid of government controls

单项选择题

Which of the following statements is NOT true

A．The results of economic decisions cannot always be predicted.
B．Minimum wage can not always protect employees.
C．Economic theory can predict the results of economic decisions if other factors are not changing.
D．Economic decisions should not be based on economic theory.