单项选择题

What does the "invisible hand" refer to

A．Supply and demand.
B．Laissez faire.
C．Self-interest.
D．Non-interference from the government.
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单项选择题
How do students find out about water pollution
A．They consult pollution experts.
B．They collect water samples.
C．They conduct species surveys.
D．They read books on pollution.
单项选择题
In Smith's view, monopolies ______.
A．will lead to the maximization of production
B．can hardly realize the checks and balances of competition
C．may bring about high production and low demand
D．will not benefit society in the long run
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