单项选择题

Its skin color follows a regular twenty-four hours cycle that exactly matches the daily ______ of the sun.

A．rotation
B．variance
C．rhythm
D．motion
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单项选择题
The possibility of ______ life is a principle belief of many religions.
A．permanent
B．exceeding
C．instantaneous
D．eternal
单项选择题
Although the hazards of space travel are many, tile rewards made it a worthwhile ______.
A．endeavor
B．execution
C．expenditure
D．expedition
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