[判断题]常规通信器材失效时，应充分利用声、光和手势等方式，约定通信信号和联络方式，建立紧急通信渠道。同时，在地下建筑等信号盲区，还可架设中继台。（）
A.正确
B.错误

Passage Two
Only moments after announcing a policy of zero tolerance on cellphone use in the classroom, Ali Nazemi heard a ring. Nazemi, a business professor at Roanoke College in Virginia, took out a hammer and walked towards a young man. He smashed the offending device. Students’ faces turned white all over the classroom.
This episode reflects a growing challenge for American college teachers in, as the New York Times puts it, a "New Class (room) War: Teacher vs. Technology". Fortunately, the smashed-phone incident had been planned ahead of time to demonstrate teachers’ anger at inattentive students distracted by high-tech gadgets.
At age 55, Nazemi stands on the far shore of a new sort of generational divide between teacher and student. The divide separates those who want to use technology to grow smarter from those who want to use it to get dumber. Perhaps there’s a nicer way to put it. "The
A. students in his class didn’t listen to his announcement
B. he hated new gadgets such as cellphones
C. he no longer tolerated cellphone use in the classroom
D. he wanted to show how distractive the cellphone was