单项选择题

If you keep on taking on more work than you can do, your health will _________.

A．decline
B．degrade
C．degenerate
D．deteriorate
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单项选择题
What the government should do urgently is to take actions to the economy.
A．brook
B．blush
C．boost
D．brood
单项选择题
This line was carrying equal number of eastbound and westbound trains, and they _________ regularly.
A．altered
B．alternated
C．switched
D．exchanged
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