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單項選擇題

This machine works very well so long as no one（）with it.

A.interferes
B.disturbs
C.upsets
D.interrupts

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單項選擇題

During the war she always kept a（）of tinned food in the house.

A.load
B.substitute
C.conservation
D.reserve

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