单项选择题

21（）

A．down
B．up
C．away
D．off

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单项选择题
Plants will emit an increased amount of heat when they are ______.
A．sprayed with pesticides
B．in pour physical condition
C．facing an infrared scanner
D．exposed to excessive sun rays
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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