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.
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单项选择题
A．Diligent.B．Interesting.C．Creative.D．Cooperative.
A．Diligent.
B．Interesting.
C．Creative.
D．Cooperative.
单项选择题
A．The ice was cut and handled with the help of some special tools.B．The ice was taken from the flowing river with hooks and carried by sleds to icehouses.C．The ice was carried on the frozen surface of the pond or river.D．The ice was sawed into even blocks by workers.
A．The ice was cut and handled with the help of some special tools.
B．The ice was taken from the flowing river with hooks and carried by sleds to icehouses.
C．The ice was carried on the frozen surface of the pond or river.
D．The ice was sawed into even blocks by workers.
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