单项选择题

The paint should be mixed ______ one part of paint to two parts of water.

A．in proportion
B．in proportion to
C．out of proportion
D．in the proportion of
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单项选择题
Though we ______ serious natural disasters, we are sure to overcome all difficulties.
A．undergo from
B．suffer from
C．experience with
D．put up with
单项选择题
His name was ______ of my tongue, but I just couldn't remember it.
A．at the end
B．at the edge
C．on the tip
D．on the point
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