单项选择题

A．Separate houses were built for storing ice.
B．Double walls were built in icehouses to keep cool.
C．Blocks of ice were packed with hay in icehouses.
D．Ice was put into icehouses in winter.
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单项选择题
A．Friends.B．Two police officers.C．A police officer and an investigator.D．A police officer and a program hostess.
A．Friends.
B．Two police officers.
C．A police officer and an investigator.
D．A police officer and a program hostess.
填空题
The United States has turned itself from a hegemonic power to a guardian of democracy by the introduction of to the Middle East.
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