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
He suffered from mental illness and had no clear ______ of right and wrong.
A．thought
B．idea
C．concept
D．opinion
单项选择题
Many non-governmental colleges have been ______ in recent years which allow more students to have a chance to go to college.
A．established
B．constructed
C．erected
D．built
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