单项选择题

A．A fuel that burns cleanly.
B．A material from which filters are made.
C．An oil additive that helps cool engines.
D．An insulating material sprayed on engine parts.
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单项选择题
A．Mary earned the prize.B．Mary fails in the speech contest.C．Mary has granted the prize..D．Mary shouldn’t earn the prize.
A．Mary earned the prize.
B．Mary fails in the speech contest.
C．Mary has granted the prize..
D．Mary shouldn’t earn the prize.
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