单项选择题

A．Cats and humans are similar creatures.
B．Cat naps can get rid of tiredness.
C．Cat naps can make people’s moods better.
D．Cat napping is a way to build up body’s energy.
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单项选择题
A．Lightning, the weapon of the gods.B．The invention of the lightning rod.C．An electric storm.D．Lightning and its preventive measures.
A．Lightning, the weapon of the gods.
B．The invention of the lightning rod.
C．An electric storm.
D．Lightning and its preventive measures.
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