单项选择题

A．Nicotine.
B．Ashes.
C．Smoke.
D．Tar.
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单项选择题
He thought he could talk Mr. Robinson ________ buying some expensive equipment.
A．on
B．of
C．round
D．into
单项选择题
________ I admit that there are problems, I don't think that they cannot be solved.
A．Unless
B．Until
C．As
D．While
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