单项选择题

Nurses should do all they can to make their patients feel ______.

A．on beard
B．at ease
C．at leisure
D．at heart
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单项选择题
We are still ______ things here, but I can't guarantee the situation will stay that way.
A．in memory of
B．in search of
C．in control of
D．in need of
单项选择题
Now a paper argues that organic chemicals in the rock come mostly from ______ on earth rather than bacteria on Mars.
A．configuration
B．constitution
C．condemnation
D．contamination
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