在危难时，我们可以拔打求救电话获得有关部门的救助。当你发现火灾要报警时，应拔打[ ]
A、119
B、120
C、110
D、315
答案：A
This company was the first ___________ portable radios as well as cassette tape recorders in the world.[ ]
A. producing
B. to produce
C. having produced
D. produced
