单项选择题

After legalization and regulation of prostitution, the main cause of reduction in the spread of venereal diseases would probably be______.

A．the practitioners would be licensed '
B．the practitioners would receive regular medical examination
C．the practitioners already diseased would be made known
D．those already diseased could choose each other as partner
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单项选择题
Legalization and regulation of commercial vices would bring all the following benefits EXCEPT ______.
A．the police force could be reduced
B．illegal dealers would be forced out of business
C．there would be no more drug dealers
D．the practices might become a source of revenue
单项选择题
According to the passage, which of the following statements is TRUE
A．Only small countries adopt the unitary system.
B．Unitary states all have uniform culture.
C．Multinational states can be unitary states.
D．The federal system is more suitable for communist states.
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