单项选择题


A．standards
B．levels
C．degrees
D．layers
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单项选择题
The heating system has recently been _______ to make it more efficient.
A．modified
B．amended
C．altered
D．changed
单项选择题
The New York Times has ________ in France, Germany, and other countries.
A．reporters
B．journalists
C．announcers
D．correspondents
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