单项选择题

The ______ estimate of gains in gross national product suggested a fast recovery from economic recession.

A．introductory
B．possible
C．primary
D．preliminary
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单项选择题
Mrs. Wilson works more slowly than the other secretaries because she takes pride ______ everything that she does.
A．in
B．of
C．to
D．on
单项选择题
The disease has completely ______ in this country.
A．died out
B．died down
C．died away
D．died off
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