单项选择题

The old man got things straight enough to settle down at last to his usual ______.

A．habit
B．practice
C．routine
D．custom
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单项选择题
Light ______ will be served during the interval
A．refreshments
B．meal
C．food
D．drinks
单项选择题
Unemployment was at the ______ of the problem.
A．bulb
B．seed
C．root
D．shoot
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