单项选择题
A.consume B.swallow C.exhaust D.dispose
This machine works very well so long as no one（）with it...
单项选择题This machine works very well so long as no one（）with it.
A.interferes B.disturbs C.upsets D.interrupts
During the war she always kept a（）of tinned food in the...
单项选择题During the war she always kept a（）of tinned food in the house.
A.load B.substitute C.conservation D.reserve
The ratio of the work done by the machine（）the work don...
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
