单项选择题

No one can be ______ calm when facing with a great danger.

A．very
B．so
C．too
D．enough
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单项选择题
The Martian surface temperature is 100 degrees below zero at night, so that butter put outside will not ______ .
A．thaw
B．dissolve
C．melt
D．fuse
单项选择题
She is the ______ holder of the 3,000-meter world record, but there is no guarantee that she will win in the Olympic Games.
A．current
B．predominant
C．prevailing
D．prevalent
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