3．C　解析：推理判断题。根据文章中列举的研究中的数字尤其是倒数第二段中的“nearly a quarter admitted their smartphones create communication issues within‘real life’”可知，手机上瘾已成为社会生活中的一个现实；再结合第五段中的“it should be made compulsory that anyone selling smartphones should warn customers”和最后一段中的“should be more aware of how they are using their smartphones and of the potential risks of excessive use”可知，人们应该认真对待手机上瘾这件事。故选C项。

　　B

　　(2015·西工大附中适应性训练)It is safe to say that George Bernard Shaw(1856­1950)，the Irish­born writer，is more famous for being George Bernard Shaw than he is for his writings today.Few of Shaw's more than 60 plays，novels and essays are performed or read anymore.And yet Shaw genuinely helped make our modern world.Although you'd be lucky to get a chance to see one of his dramas today，in his time he turned the theater into a vehicle for the discussion of social issues，not only in Britain but on the stage of the world.In a way Shaw was someone who created the modern culture of Britain.

　　Where the theater had been dominated by entertainment，Shaw used it to teach people the importance of paying attention to the issues of their day.The plight(苦难)of the poor and the working class，the situation of women and the institutions of society，such as the education system—Shaw was among the most well­known figures making these topics central to public debate.His first play，Widowers' Houses(1892)，deals with the question of slum(贫民窟)housing.His Mrs Warren's Profession(1893)brought a controversial topic to the stage.

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