单项选择题

A．As one of the greatest American scholars.
B．As one of America’’s most ingenious inventors.
C．As one of the founding fathers of the United States.
D．As one of the most famous activists for human rights.
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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.
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