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
After years of ____________ bee dancing, the scientist found that the dances have certain patterns.
A．gazing
B．watching
C．observing
D．viewing
单项选择题
The light bulb in the bathroom burned ____________ and Father put in a new one.
A．off
B．down
C．out
D．away
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