单项选择题

What should we do with power tools if they must be left unattended according to the passage

A．Be sure power tools are turned off.
B．Keep children indoors.
C．Never smoke.
D．Never let young children operate them.
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单项选择题
We can never work with electric power tools in ______ conditions.
A．wet
B．any
C．hot
D．cold
单项选择题
The word cover in Newsweek and Time magazines have both covered the phenomenon ( paragraph 2 ) means ______.
A．place one thing over another
B．include
C．report
D．protect
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