单项选择题

Chemistry is the science of ______ while physics is the science of energy.

A．bodies
B．objects
C．substances
D．matters
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单项选择题
The picture taken with my classmates ______ my school days to my mind.
A．recalled
B．reminded
C．remembered
D．recollected
单项选择题
At any moment someone may discover how to ______ cancer which is a big problem human beings face.
A．heal
B．recover
C．cure
D．treat
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