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
In some countries, students are expected to be quiet and ____________ in the classroom.
A．faithful
B．obedient
C．subjective
D．skeptical
单项选择题
The bicycle is a form of transport whose ____________ we take for granted.
A．expenditure
B．satisfaction
C．coordination
D．convenience
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