單項(xiàng)選擇題We still do not know ().

A.where is the trouble
B.where does the trouble
C.where the trouble lies
D.what is the trouble


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1.單項(xiàng)選擇題A moving object will not accelerate or decelerate ()a force is applied to it.

A.whether
B.if
C.unless
D.till

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題It is obvious that the expansion of the water ()the increase of its temperature.

A.is due to
B.dues to
C.is because
D.is for

5.單項(xiàng)選擇題An engineer, together with some motormen ()to help in the repair work.

A.send
B.sends
C.was sent
D.were sent