6.The author believes “teenagers today are much smarter than we think” because they 　. 

　　A.are quick-minded

　　B.are well-informed

　　C.can use modern technologies on their own

　　D.can act according to changing circumstances

　　7.Which of the following shows the structure of the text?

　　Ⅱ.七选五

　　The science of optimism

　　Optimism is a research-proven mind-set that will get you what you want.Here’s how to use it.

　　You failed a test.1.　 Your mom won’t get off your case about your report card.You feel very upset,and no one can help you. 

　　But hold up!A positive mind-set matters.It’s a choice you can make at any time,which research has proven can increase your chances of staying healthy,overcoming challenges,and achieving your goals.2. 

　　Optimism simply gives you power.It motivates you to take care of yourself and to work hard—the same thing pessimism takes away.“When we think that something is possible,we are more likely to work toward it,”says Tali Sharot,a scientist.“An optimistic mind-set changes what you do every day.3.　” 

　　The good news?You can learn to become an optimist,even if you aren’t already one naturally.4. Because the secret to success is being certain the sun will shine—but also carrying an umbrella,just in case.

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