单项选择题

A．In our daily life.
B．In business and universities.
C．In government and industry.
D．Both A and B.
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单项选择题
A．Because it isn’t closed.B．Because its door is open.C．Because the students have to pass all examinations before entering it.D．Because there is no examination before they are accepted as students.
A．Because it isn’t closed.
B．Because its door is open.
C．Because the students have to pass all examinations before entering it.
D．Because there is no examination before they are accepted as students.
单项选择题
A．Twenty years.B．Five years.C．A couple of weeks.D．A couple of years.
A．Twenty years.
B．Five years.
C．A couple of weeks.
D．A couple of years.
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