题目

Owning a smart phone may not be as smart as you think.They may let you surf the Internet,listen to music and snap photos wherever you are…but they also turn you into a workaholic（工作狂）,it seems. A study suggests that,by giving you access to emails at all times,the smart phone adds as much as two hours to your working day.Researchers found that Britons work an additional 460 hours a year on average as they are able to respond to emails on their mobiles.The study shows the average UK working day is between 9 and 10 hours,but a further 2 hours is spent responding to or sending 判断对错 (1)4×5÷4=5 (　　) (2)50＋30＋20=100 (　　)