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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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
单项选择题
The announcement was widely hailed in the media as a ______ but the extent of the restrictions was not specified.
A．implementation
B．breakthrough
C．interpretation
D．breakdown
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