What if I took that big jump on my bike?What’s the worst thing that could happen if I go out at midnight?Should try smoking?The teen years can play out like a choose-your-own-adventure novel.
Teenagers must act on an endless parade of choices.Some choices.including smoking.Come with serious consequences.As a result, adolescents often find themselves trapped between their impulsive tendencies（-Just try it!)and their newfound ability to make well-informed and logical choices（-Wait, maybe that’s not such a good idea!）.
So what makes the teenager’s brain so plex? What drives adolescents-more than any other age group-to sometimes make rash or questionable decisions?
If you have ever thought that the choices teenagers make are all about exploring and pushing limits, you are on to something. Experts Experts believe that this tendency marks a necessary period in teen development.The process helps prepare teenagers to confront the world on their own. It is something all humans have evolved to experience-yes, teens everywhere go through this exploratory period.Nor is it unique to people:Even laboratory mice experience a similar stage during their development.
For example，laboratory experiments show that young mice stay close by their mothers for safety. As mice grow．their behavior does too．“When they reach puberty，they’re like，‘I’m gonna start checking out how this environment looks without my mom，…explains Beatriz Luna,of the University of Pittsburgh．
As a developmental cognitive neuroscientist，Luna studies those changes that occur in the brain as children develop into adults．She and other researchers are showing how the teen experience can lead to powerful advantages later in life．Take mice again：Young mice that explore most tend to live longest——that is，unless a cat eats them，Luna adds．
【小题1】What is the best title for the text?A．Teenagers make endless choicesB．The teenage brain drives them to be differentC．How the teenage brain developsD．Researches about the teenagers【小题2】What does the underlined sentence in paragraph 4 mean?A．It means “you are wrong”.B．It means“you lose your way”．C．It means“you get the point”．D．It means“you are off the point”.【小题3】According to the text,the teenager who explores most wiIlA．make no mistakes in his life．B．have advantages over others.C．loSe his confidence even his life.D．experience no failure and live Iongest.【小题4】What does the writer want to tell us by taking mice for example？A．young mice try to look for safety.B．Young mice like to stay with their mothers.C．Mice also experience a period to explore the world.D．Mice experience different stages.【小题5】What may the text discuss in the next part?A．How call a teenager make right choicesB．Why the parents shouldn’t allow teenagers to smokeC．What has been discovered in the lab experiment．D．What really goes on in the teenage brain.B
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(答案→)B
解析：文章介绍了青少年的大脑和行为发生了变化，会做出不同选择，这是青少年发展的必然时期。
【小题1】主旨题：根据全文内容可知，文章介绍了青春期触发了孩子大脑和行为的变化，青少年会做出不同选择。故选B。
【小题2】推理题： 根据第四段第一句“If you have ever thought that the choices teenagers make are all about exploring and pushing limits, you are on to something.”如果你曾认为青少年的选择都是关于探索和突破限制,你意识到了某事。选项中只有C项“你抓住重点”与句意相符。故选C。
【小题3】推理题：根据第四段中“Experts believe that this tendency marks a necessary period in teen development.The process helps prepare teenagers to confront the world on their own”专家相信这种趋势标志着青少年发展必要的时期。这一过程可以帮助青少年自己面对世界做好准备。故选B。
【小题4】细节题：根据第四段最后一句“Nor is it unique to people:Even laboratory mice experience a similar stage during their development”甚至也不是独特的人:实验室老鼠经历类似的在他们的发展阶段。故选C。
【小题5】推理题：全文介绍了青少年在青春期的做出的不断探索行为。接下来就会说明什么促使青少年大脑做出这些行为。故选D。