单项选择题

We have to think very carefully before we take any action, because it's a very ______ situation we are in.

A．ideal
B．favourable
C．good
D．severe
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单项选择题
Since the accident he has walked with a ______ .
A．slope
B．limp
C．lame
D．strain
单项选择题
The microscope enables scientists to distinguish a(n) ______ number and variety of bacteria.
A．selected
B．incredible
C．verifiable
D．unavoidable
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