单项选择题

The examination was quite exhausting because of its difficulty and length.

A．long
B．exciting
C．tiring
D．refreshing
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单项选择题
Lewis withdrew from administration to devote himself to teaching.
A．wandered
B．recovered
C．quit
D．pulled
单项选择题
It is easy for scientists to understand the significance of the doctor's findings.
A．complexity
B．simplicity
C．clearness
D．importance
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