單項選擇題They are two dollars each but if you buy ten, you get a（）of ten per cent.

A.discount
B.recession
C.depression
D.discharge


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2.單項選擇題The survival of civilization, as we know, is（）threat.

A.with in
B.under
C.to wards
D.upon

3.單項選擇題The wise man exercises（）in his behavior and enjoyments.

A.limitation
B.interest
C.restriction
D.restraint

4.單項選擇題The police will give you a ticket if you（）the speed limit.

A.break
B.reject
C.suspend
D.exceed

5.單項選擇題I guess the whole paper has to be rewritten; only the first few paragraphs may be（）

A.sustained
B.contained
C.maintained
D.retained