单项选择题
You had better have more（）of catching the train if you got a bus to the station instead of walking.
A.chanceB.liftC.offerD.luck
单项选择题 （）you have finally answered the question，perhaps we'd better ask someone else.
单项选择题 出现异常时通风排毒系统的处理能力应在（）min内消除事故部位绝大部分的有毒气体。
单项选择题 We must consider the problem in all its（）.
