This snowball is than that one.[ ]
A. too big
B. big
C. bigger
答案：C
The idea _________ useless. [ ]
A. seemed to be
B. seemed to
C. seemed be
D. seemed be to
发现危及安全时，防护人员应（）
A、经汇报同意后拦停或通知值班员（调度员）扣停列车
B、果断拦停或通知值班员（调度员）扣停列车
C、通知值班员（调度员）扣停列车
