单项选择题

His heart was ______ so violently that he could hardly catch his breath.

A．bouncing
B．beating
C．jumping
D．punching
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单项选择题
The population of this area is mainly ______ Hispanic- Americans and American Indians.
A．composed of
B．comprised of
C．consisted of
D．constituted of
单项选择题
He's always ready to take ______ heavy responsibilities.
A．on
B．to
C．in
D．after
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