单项选择题

A．To do comprehensive exercises.
B．To read simple sentences.
C．To copy out from the textbooks.
D．To do all of the above.
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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．Graduate school application procedures.B．Funding for university education.C．Winning the confidence of voters.D．Preparing for an important test.
A．Graduate school application procedures.
B．Funding for university education.
C．Winning the confidence of voters.
D．Preparing for an important test.
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