单项选择题

A．One.
B．Two.
C．Three.
D．Four.
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单项选择题
A．Professor Simms kept the class late.B．He couldn’t find Professor Simms’s classroom.C．Professor Simms, lecture is about the sea.D．He didn’t understand Professor Simms’ lecture.
A．Professor Simms kept the class late.
B．He couldn’t find Professor Simms’s classroom.
C．Professor Simms, lecture is about the sea.
D．He didn’t understand Professor Simms’ lecture.
填空题
Some experts believe that, if not for the cultural changes that Africa has experienced, the AIDS virus would not have spread to its present extent.
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