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
Although the hazards of space travel are many, tile rewards made it a worthwhile ______.
A．endeavor
B．execution
C．expenditure
D．expedition
单项选择题
As a way of ______ the mails while they were away, the Johnsons asked the cleaning lady to send little printed slips asking the senders to write again later.
A．picking up
B．coping with
C．passing out
D．getting across
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