单项选择题

It is strange that he______ so rude to you, though you did so much for him.

A．should be
B．should have been
C．is
D．was
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单项选择题
He has ______a very odd set of people. I hope they won' t have a bad influence on him.
A．got mixed up with
B．got involved in
C．lined up with
D．come up with
单项选择题
Science is the systematic______ of knowledge using nature itself or laboratory models and experiments.
A．acquisition
B．exploration
C．survey
D．pursuit
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