单项选择题

A．The design of stamps.
B．The color of stamps.
C．The words on many stamps.
D．The size of the stamps.
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单项选择题
A．A fuel that burns cleanly.B．An oil additive that helps cool engines.C．A material from which filters are made.D．An insulating material sprayed on engine parts.
A．A fuel that burns cleanly.
B．An oil additive that helps cool engines.
C．A material from which filters are made.
D．An insulating material sprayed on engine parts.
单项选择题
A．Florida.B．California.C．Nevada.D．Hannibal.
A．Florida.
B．California.
C．Nevada.
D．Hannibal.
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