单项选择题

We should always keep in mind that ______ decisions often lead to bitter regrets.

A．urgent
B．hasty
C．instant
D．prompt
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单项选择题
These experiments all ______ that a liquid exerts an upward force on any object placed in it.
A．indicate
B．suggest
C．mean
D．imply
单项选择题
The international situation has been growing ______ difficult for the last few years.
A．invariably
B．presumably
C．increasingly
D．dominantly
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