当发现柴油机汽缸垫烧损时，应（），分析其烧损原因，
A.立即停车
B.低速运转
C.高速运转
D.正常运转
参考答案：A
The growing speed of a plant is influenced by a number of factors, are beyond our control. [ ]
A.most of them
B.most of which
C.most of what
D.most of that
—_______ will it take me to get to the Golden Street?
—About half an hour. [ ]
A. How far
B. How long
C. How often
D. How much
