单项选择题

The fact that Franklin was not injured was apparently due to ______.

A．luck
B．planning
C．wisdom
D．the materials he used
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单项选择题
It is dangerous to put iron wire in socket(插座). Which of the following explains why this is so
A．The iron wire picks up electrical charges.
B．The strands begin to bristle with electricity.
C．As rain wet the string, it conducted more electricity.
D．Franklin might have been killed by a bolt of lightenin
单项选择题
Franklin used all of the following things EXCEPT ______.
A．string
B．thermometer
C．kite
D．wire
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