The survival of civilization, as we know, is（）threat.

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

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

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

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

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

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

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

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

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

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

单项选择题Professor Collins was（）of the latest developments in physics because he had been in hospital for several months.

A.unconscious
B.negative
C.robbed
D.ignorant

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

单项选择题There is need to check the（）of the report.

A.frequency
B.accuracy
C.emergency
D.efficiency

单项选择题Her pulse was so weak that the doctor had difficulty（）it.

A.inspecting
B.detecting
C.touching
D.contacting