单项选择题

A．Minerals.
B．Chemical pollutants.
C．Salt.
D．Germs.
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单项选择题
A．It is authentic.B．It is imaginative.C．It is complicated.D．It is dull.
A．It is authentic.
B．It is imaginative.
C．It is complicated.
D．It is dull.
单项选择题
A．Its use of gasoline.B．The horses that drew it.C．Its circular platform.D．Its weight.
A．Its use of gasoline.
B．The horses that drew it.
C．Its circular platform.
D．Its weight.
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