单项选择题

Some economists believe women earn less than men partly because ______.

A．there are more than enough women in the labor force
B．women have more freedom in selecting jobs
C．women are only provided with low-paid jobs
D．women ale less experienced than men
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单项选择题
Food packages, bottles and tins for drinks can cause ______.
A．air pllution
B．both the litter problem and waste of resources
C．excess consumption
D．unnecessary buying
单项选择题
In the writer; s view, the more new goods there are, ______.
A．the less pollution we have
B．the harder pollution can be done away with
C．the more pollution there will be
D．the more easily pollution can be controlled
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