单项选择题

They ______ TV for two hours.

A．had watched
B．are watching
C．watched
D．have been watching
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单项选择题
The most appropriate title for this passage is ______.
A．The Invention of the Kite
B．The History of the Kite
C．The Kite and Science
D．Franklin's Experiment with Lightening
单项选择题
From the passage we know that Benjamin Franklin ______.
A．recorded the temperature of clouds
B．was killed by a bolt of lightening
C．proved that lightening can be controlled by msn
D．proved that lightening and electricity have the same essential nature
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