11．Being a teenager can be challenging，but it can also be exciting．You*re becoming more independent and making decisions for yourself．You are also learning to take risks and solve problems better．And changes are happening throughout your body，even in your brain．
The changes in your brain are influencing how you develop into an adult．Imagine the structure（结构）of your brain is like a big road map．Lots of roads lead to different destinations（目的地）．When you were a child as you learnt new things，your brain created more and more roads to different destinations．By the time you become a teenager，many different roads lead to the most important places on the map．Now your brain's job is to make that map more efficient．
As a result，your experiences as a teenager actually influence the way that your brain develops．If you spend hours playing video games，what skills do you use？You learn to see something with your eyes and respond to it with your hands．As you develop those skills，your brain is making sure that the roads leading to them are especially fast and efficient．So，your video-game playing could be preparing you for a career such as a pilot．
This is a great time for you to practice new skills and discover what you're good at and try what you love doing．Go out and try different activities，and stick to them if
you think they're useful．Remember that with everything you do，you're shaping your brain for the future．
72．What happens as children learn new things？C
A．Their brains make the maps more efficient．
B．The structures of their brains are like big road maps．
C．Their brains create more roads to different destinations．
D．Many different roads lead to the most important places．
73．What does the underlined word"it"in Paragraph 3refer to？B
A．Your brain．
B．Something you see．
C．Your skill．
D．Something you learn．
74．What's the writer's advice for teenagers？D
A．Teenagers should learn to be more independent．
B．Teenagers should work harder and more efficiently．
C．Teenagers should play more video games in order to be a pilot．
D．Teenagers should experience more and stick to the useful activities．
75．Which would be the beat title for the passage？B
A．Making Decisions for Yourself．
B．Developing Your Brain for the Future．
C．Ways of Changing Your Brain．
D．Changes Happening in Your Brain．
分析 文章大意：这是一篇日常生活类阅读，主要介绍作为一个年轻人要具有挑战性，这样去锻炼你的大脑，去学习冒险和更好地解决问题．尝试练习新技能，在好时间做喜欢的事情，尝试不同的活动，并坚持下来，这对塑造你的大脑，对你未来的发展有好处．
解答 72．答案：C．细节理解题．根据第二段第二行When you were a child as you learnt new things，your brain created more and more roads to different destinations当你是个孩子时你学到了新的东西，你的大脑创造了越来越多的道路去不同的目的地．可知，选C．
73．答案：B．词意猜测题．根据句意"你学会用你的眼睛看到的东西，并用你的双手回应它．"，可知，这里的it代指的是Something you see你看到的东西，选B．
74．答案：D．细节理解题．根据最后一段Go out and try different activities，and stick to them if you think they're useful去尝试不同的活动，并坚持如果你觉得他们是有用的．可知，作者建议青少年应该体验更坚持有益的活动．选D．
75．答案：B．标题猜测题．根据最后一句Remember that with everything you do，you're shaping your brain for the future．记住，你所做的一切，你正在为你的未来塑造你的大脑．可知，短文主要讲通过各种锻炼，挑战，学习技能发展兴趣等，为未来开发自己的大脑，题目可以是为未来开发你的大脑，选B．
点评 阅读题型，要注重句子与句子之间、段落与段落之间逻辑关系以及对篇章的整体理解．根据所给问题选择正确选项完成试题．
