单项选择题

He tried to cope with the ever-increasing burden of his work, but finally __________ and had to take a complete rest.

A．broke away
B．broke down
C．broke off
D．broke through
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单项选择题
These birds are __________ because they are the only ones in this region with this type of coloring.
A．special
B．extraordinary
C．especial
D．unique
单项选择题
Although architecture has artistic qualities, it must also satisfy a number of important practical
A．regulations
B．obligations
C．considerations
D．observations
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