单项选择题

The discrepancies between these different analyses ______ a number of problems.

A．summon
B．pose
C．confront
D．marshal
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单项选择题
You may never experience an earthquake or a volcanic eruption in your life, but you will ______ changes in the land.
A．adapt
B．undergo
C．witness
D．define
单项选择题
It is sometimes difficult to discuss medical issues in a way that is not ______ to ordinary people.
A．conspicuous
B．ambiguous
C．intelligible
D．ingenious
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