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单项选择题
Why do springs emit a distinctive odor?
A．The springs contain various
microelements.
B．There are rotten creatures in the springs.
C．There are waste materials on the surface of springs
D．The springs release poisonous gas.
B．There are rotten creatures in the springs.
C．There are waste materials on the surface of springs
D．The springs release poisonous gas.
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