单项选择题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.单项选择题The survival of civilization, as we know, is()threat.

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

3.单项选择题The wise man exercises()in his behavior and enjoyments.

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

4.单项选择题The police will give you a ticket if you()the speed limit.

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

5.单项选择题I guess the whole paper has to be rewritten; only the first few paragraphs may be()

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

6.单项选择题Very few plants will()without water.

A.flourish
B.fade
C.stem
D.cultivate

7.单项选择题Years of()labor had hardened his muscles.

A.survival
B.mental
C.restless
D.manual

8.单项选择题Fertilizer will()the growth of these tomato plants.

A.accomplish
B.accelerate
C.accumulate
D.account

10.单项选择题The old man did not seem to attach any importance()the question.

A.to
B.with
C.towards
D.for