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I (physical)
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单项选择题
A．How to use an encyclopedia.B．Encyclopedias in the future.C．The function of a computer network.D．Where to look for up-to-date information.
A．How to use an encyclopedia.
B．Encyclopedias in the future.
C．The function of a computer network.
D．Where to look for up-to-date information.
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A．An airplane designer.B．A science fiction writer.C．The inventor of rockets.D．A famous theoretical physicist.
A．An airplane designer.
B．A science fiction writer.
C．The inventor of rockets.
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