单项选择题

We are convinced that we are on the ______ of an important discovery.

A．threshold
B．household
C．thread
D．entrance
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单项选择题
Living in poverty, John sold for 500 dollars the ______ of his mother's first work which made her famous.
A．document
B．file
C．duplicate
D．manuscript
单项选择题
A ______ translation is not always the closest to the original meaning.
A．liberal
B．literal
C．literary
D．literate
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