单项选择题

A．Making eye contact and raising your hand.
B．Making a writing gesture with one hand as the pen and the other hand as the paper.
C．Shaking your head from side to side.
D．Shaking your head up and down.
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单项选择题
A．The apartment was very dirty.B．He had his old furniture cleaned.C．He found an apart with a big yard.D．The furniture was very inexpensive.
A．The apartment was very dirty.
B．He had his old furniture cleaned.
C．He found an apart with a big yard.
D．The furniture was very inexpensive.
单项选择题
A．Make up homework problems.B．Do research in the library.C．Teach an introductory economics course.D．Grade homework sets.
A．Make up homework problems.
B．Do research in the library.
C．Teach an introductory economics course.
D．Grade homework sets.
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