单项选择题

A．Minerals.
B．Chemical pollutants.
C．Salt.
D．Germs.
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单项选择题
A．Allan and Catherine will come to dinner that night.B．Allan and Johnson will come to join the dancing party that night.C．Allan and Thomson will come to have dinner with them that night.D．Mary and Catherine will come to dinner that night.
A．Allan and Catherine will come to dinner that night.
B．Allan and Johnson will come to join the dancing party that night.
C．Allan and Thomson will come to have dinner with them that night.
D．Mary and Catherine will come to dinner that night.
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