单项选择题
A.where is the trouble B.where does the trouble C.where the trouble lies D.what is the trouble
A moving object will not accelerate or decelerate （）a f...
单项选择题A moving object will not accelerate or decelerate （）a force is applied to it.
A.whether B.if C.unless D.till
When was your ship built? （）is a new oneShe was deliver...
单项选择题When was your ship built? （）is a new oneShe was delivered to us by Bremen Shipyard only three months ago.
A.Ours B.Ours ship C.Our’s ship D.Our’s
Every precaution must be taken to avoid （）.A.sparking b...
单项选择题Every precaution must be taken to avoid （）.
A.sparking being taking place B.to spark taking place C.sparking to be taken place D.sparking taking place
