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

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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

单项选择题

It can be inferred from the passage that typical court cases are______.

A．always appealed
B．usually solved in the district courts
C．always overlapping
D．usually settled by the Supreme Court