单项选择题

（）one of the subjects that appeal to many university students.

A．Economics is
B．Economice is
C．Economics are
D．Economics have been

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单项选择题
The world（）is made up of matter.

A．in that we live
B．on which we live
C．where we live in
D．we live in
单项选择题
（）we have finished the course, we shall start doing more revision work.

A．For now
B．Now that
C．Ever since
D．By now
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