解析：选D　细节理解题。根据第三段第三句中的“found that quick walking reduces the risk of heart disease more effectively than running”以及下文将步行和跑步从几个方面进行的对比来看，前者优于后者。故D项正确。

　　12．In which section of a newspaper can we read this text?

　　A．Comment.

　　B．Lifestyle.

　　C．Education.

　　D．Science.

　　解析：选B　推理判断题。纵观全文可知，本文主要介绍了健康生活方式中的最简单有效的方式——步行。由此可推知，可从报纸上介绍生活方式的版块读到该文章。故B项正确。

　　D

　　(2016·包头市高三统一考试)Smartphones are really addictive and the more you use one, the worse it gets, a new study has revealed. Psychology lecturer, Dr Zaheer Hussain, who conducted the research, found that the more you use a smartphone, the higher your risk of becoming addicted.

　　He explained that higher

　　scores of narcissism — defined as excessive (过度的) interest or admiration of oneself and ones physical appearance — are the most common and obvious sign of the addiction.

　　An obsession (痴迷) with taking selfies and posting them on social media is one key indication.

　　The study found that 13 percent of 256 participants were addicts. The average age of those who took part in the online survey was 29.

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