单项选择题

To prevent flooding in winter the water flowing from the dam is constantly ________ by a com- puter.

A．graded
B．managed
C．conducted
D．monitored
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单项选择题
The elderly Russians find it hard to live on their state ________.
A．pensions
B．earnings
C．salaries
D．donations
单项选择题
The two most important ________ in making a cake are flour and sugar.
A．elements
B．components
C．ingredients
D．constituents
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