单项选择题


A．instrument
B．appliance
C．apparatus
D．equipment
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单项选择题
In a developed country, people will perhaps go out of work if the birthrate ______.
A．goes up
B．goes down
C．remains stable
D．is out of control
单项选择题
Small population may mean ______.
A．higher productlvity, but a lower average income
B．lower productivity, but a higher average income
C．lower productivity and a lower average income
D．higher productivity and a higher average income
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