单项选择题

Many important discoveries relating to the ____________ of electricity were made in the 18th century.

A．appearances
B．surroundings
C．occurrences
D．phenomena
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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
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
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