单项选择题

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单项选择题
A．Planets.B．The moon.C．The sun.D．Gods.
A．Planets.
B．The moon.
C．The sun.
D．Gods.
单项选择题
A．Through food.B．Through air.C．Through insects.D．Though body fluids.
A．Through food.
B．Through air.
C．Through insects.
D．Though body fluids.
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