1.80 percent of U.S. businesses are overcharged on their phone bills while telecom companies reap profits from accidental billing errors

　　1、D 2、B 3、D

　　4、it's a surcharge and pay the bill without thinking about it

　　5、Ignorance ;complacency

　　2.The evolution of investments decision mode in China’s telecommunications

　　1、D 2、B 3、A 4、C 5、C

　　3.:Edison and American Electro-Technology (II)

　　1、B 2、B 3、B 4、A 5、C

　　4.Edison and American Electro-Technology (I)

　　1、D 2、A 3、D 4、D 5、C

　　5. A National Undertaking-Sports

　　1. the way they were brought up

　　2. professional physical educators/the coaches,systematic training

　　3. honor and reputation to the college

　　4. admission fee and loot from TV and radio-telecast and ads

　　5. professionalism

　　6.Wrestling

　　1、folkstyle

　　2、freestyle, Greco-Roman, judo

　　3、the art of falling without injury

　　4、Hard work, discipline, grace

　　5、B

　　7.Hacker or Mike?

　　1、C 2、D 3、D 4、D