单项选择题

It will rain, ______ the barometer is falling.

A．so
B．for
C．as
D．since
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单项选择题
Did you notice the ______ on the doctor's face when he heard that Kino had found the pearl of the world
A．appearance
B．expression
C．description
D．look
单项选择题
It is very likely that the Martian will also be ______ to underground existence, for conditions are much more equable underground.
A．adopted
B．acquired
C．admitted
D．adapted
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