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
Smoking is a very bad habit, which many people find difficult to().

A．break
B．beat
C．breathe
D．cough
单项选择题
When the manager went to Canada on business, his () took over all his duties.

A．caretaker
B．officer
C．deputy
D．commander
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