单项选择题

The title that best expresses the main idea of this passage is （）

A．Knowledge Is Power
B．How to Retain and Use Knowledge
C．Physical and Mental Efforts
D．The Trained Mind Is What One Needs

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填空题

A.deot B.climo C.caoin D.como

单项选择题

A．down
B．up
C．away
D．off