單項選擇題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.單項選擇題His inability to learn foreign languages was a(n()to his career.

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

4.單項選擇題He ran so fast that he was out of()

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

5.單項選擇題Be careful with those fireworks; they are()to go off unexpectedly.

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