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A．Physical chemistry.
B．Life experience.
C．Introduction to Science.
D．Biology.
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单项选择题
A．Most of them are made in China.B．Most of them are imported from abroad.C．They made most of them by themselves.D．They made all of them by themselves.
A．Most of them are made in China.
B．Most of them are imported from abroad.
C．They made most of them by themselves.
D．They made all of them by themselves.
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