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

Mr. Stone（）the money order, otherwise he would have written back before now.

A．has received
B．ought to have received
C．couldn't have received
D．shouldn't have received

单项选择题

His health is（）

A．as poor, if not poorer than, his sister
B．poor as his sister' s if not poorer
C．as poor as, if not poorer than, his sister' s
D．as poor, if not poorer than, his sister' s