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

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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

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

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