单项选择题

A) research C)specialist
B) treatment D) operation

A．research
B．treatment
C．specialist
D．operation
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单项选择题
A) break C) throw B) drop D) fan
A．break
B．drop
C．throw
D．fan
单项选择题
A) easily C) well B) alone D) useful
A．easily
B．alone
C．well
D．useful
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