单项选择题

Fresh air is ____________ to good health. So you should go out more and take more fresh air.

A．fundamental
B．elementary
C．principal
D．dominant
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单项选择题
The strike has been on for half a year; ____________ there is a severe decline in trade.
A．unfortunately
B．frequently
C．subsequently
D．consequently
单项选择题
Some students have got together to advocate a system ____________ student work without grades.
A．modifying
B．estimating
C．evaluating
D．inspecting
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