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
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单项选择题
A．anotherB．the otherC．othersD．other
A．another
B．the other
C．others
D．other
单项选择题
Chinese diplomatic envoys were sent who should strengthen our international position and strive for world peace and friendly______ among peoples.
A．collaboration
B．harmony
C．coordination
D．intercourse
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