GMAT
With the cost of wireless service plummeting in the last year and mobile phones becoming increasingly common, many people are now using their mobile phones to make calls across a wide region at night and on weekends, when numerous wireless companies provide unlimited airtime for a relatively small monthly fee.
While the cost of wireless service has plummeted in the last year and mobile phones are increasingly common, many people are now using their mobile phones to make calls across a wide region at night and on weekends, when numerous wireless companies provide unlimited airtime for a relatively small monthly fee.
题目基本信息