D．Going on a diet.

　　解析：选A。细节理解题。由最后一段第一句的内容可知，锻炼是一种已经证实了的治疗焦虑和沮丧的方法。

　　4．Which can be the best title for the text?

　　A．Ways to treat anxiety and depression

　　B．Exercise and teenagers' health

　　C．Teenagers shouldn't drink or smoke

　　D．Teenagers' lifestyle and their happiness

　　解析：选D。主旨大意题。本文主要讲述了青少年的生活方式和他们的幸福指数之间的关系，故D项最适合。

　　B

　　Owning a smartphone may not be as smart as you think.It may let you surf the Internet，listen to music and snap photos wherever you are...but it also turns you into a workaholic，it seems.

　　A study suggests that，by giving you access to emails at all times，the all－singing，all－dancing mobilephone 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 by technology retailer Pixmania reveals the average UK working day is between 9 and 10 hours，but a further two hours is spent responding to or sending work emails，or making work calls.More than 90 percent of office workers have email－enabled phones，with a third accessing them more than 20 times a day.Almost one in ten admits spending up to three hours outside their normal working day checking work emails.Some workers confess they are on call almost 24 hours a day，with nine out of ten saying they make work emails and calls outside their normal working hours.The average time for first checking emails is between 6 am and 7 am，with more than a third checking their first emails in this period，and a quarter checking them between 11 pm and midnight.

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