单项选择题

Ice particles bouncing off hail falling through a cloud acquire______.

A．a negative charge
B．no electric charge at all
C．a positive charge
D．bot
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单项选择题
According to Dr. Scorer, lightning is caused by______.
A．rain falling through clouds
B．hail falling through supercooled clouds
C．hail falling through superheated clouds
D．ice particles falling through any clouds
单项选择题
According to the passage, district courts are also known as______.
A．circuit courts
B．supreme courts
C．intermediate courts
D．trial courts
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