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
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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
单项选择题
The tremendous heat at a star's core,______ tremendous gravity, joins the nuclei of hydrogen atoms.
A．combined with
B．having combined with
C．combining with
D．being combined to
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