单项选择题

With which of the following topics is tile passage mainly concerned

A．Research on TV influence.
B．Sex and violence on TV.
C．Parents protest against sex and violence on TV.
D．Control of TV influence on children.
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单项选择题
Some economists maintain that______.
A．we will either sacrifice employment for cleaner environment or vice versa
B．there is no compromise between the government and entrepreneurs or between the latter and the community
C．the entrepreneurs will need more workers to clean up air and water under the pressure of the government
D．pollution control will inevitably result in change in demand on the market
单项选择题
To clean up the pollution it creates, according to the passage, industry will invariably______.
A．increase its profits
B．do so at the consumers' expense
C．have to develop its production
D．go into a lawsuit against the community
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