单项选择题The ratio of the work done by the machine()the work done on it is called the efficiency of the machine.

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


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1.单项选择题His inability to learn foreign languages was a(n()to his career.

A.objection
B.defect
C.obstacle
D.depression

4.单项选择题He ran so fast that he was out of()

A.air
B.oxygen
C.breath
D.wind

5.单项选择题Be careful with those fireworks; they are()to go off unexpectedly.

A.easy
B.probable
C.available
D.liable

6.单项选择题Most people who travel in the course of their work are given travelling()

A.income
B.allowances
C.pay
D.wages

7.单项选择题The suspect's fingerprints on the gun were the main()against him.

A.crime
B.information
C.conviction
D.evidence

10.单项选择题Having come from a()society, Dick found it hard to adjust to a small town.

A.abundant
B.wealthy
C.sufficient
D.large