解析：选B　预测推断题。根据最后一段第一句可知，认知神经科学家Luna研究青少年成长为成年人的过程中大脑的变化。由此可推知，下文可能会讲青少年的大脑究竟有什么样的变化。故答案选B。

　　11．What is the main idea of the text?

　　A．Researches about the teenagers.

　　B．How the teenage brain develops.

　　C．Teenagers make endless choices.

　　D．The teenage brain drives them to be different.

　　解析：选D　主旨大意题。通读全文可知，本文主要讨论了在青少年成长的过程中，大脑的变化促使他们区别于其他年龄段的人。D项能概括文章大意。故答案选D。

　　D

　　(2016·西宁检测一)“People are ruder today because they are rushed and more ‘time poor’ than ever before，” says Patsy Rowe, “Manners_have_fallen_off_the_radar.” Due to our strong attraction to electronic equipment, it is a wonder more people don't wake up each morning and greet the singing birds with a complaint about the noise. Here are some examples of rudeness.

　　Some people prefer to do almost everything over the Internet. To them, dealing with an actual human is like an evolutionary step backward. It feels very slow because humans don't work at 4G speeds. When you have dinner with friends, you will often notice someone paying more attention to his mobile phone. We have programmed ourselves to think that every new message brings life­changing news, so taking calls and checking our texts are more important than talking to the people we are with. What is worse, some people even tend to send anonymous (匿名的) rude messages by e­mail.

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