由一个机械同时完成开挖、运输、卸土任务的有（）。
A.斗轮式挖掘机
B.采砂船、推土机
C.铲运机、推土机
D.拉铲、索铲
参考答案：C
I believe that those mountains ____ with trees in a few years. [ ]
A. are covered
B. will be covered
C. are covering
D. will cover
下面不是英国人发明创造的是[ ]
A．蒸汽机
B．蒸汽轮船
C．火车机车
D．珍妮机
