单项选择题

A．The university as a whole.
B．An association of teachers and scholars.
C．A society of legal professionals.
D．A business corporation.
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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
The Sabin vaccine was given most often on ______, but Koprowski’s vaccine was squirted into people’s mouths.
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