题目内容：

    Over the last 15 years, digital communication has ushered（引入）in more changes than the printing press did in 1570. And the stand-out early adopters in this world are teenagers, whose brains appear to have an extraordinary _____ to adapt to the world around them, according to Dr Jay Giedd, an adolescent brain expert.

We are now proving that as a species, our brains are still flexible and _____during adolescence. Having a more flexible brain means that some _____ of it, such as impulse control and the ability to make long-term decisions, haven’t developed yet, which may also explain why we spend a/an _____ period living under the protection of our parents rather than leaving home at the age of 12 or 13. This also means that the adolescent brain can adapt to new technology, allowing teenagers to _____ the accelerating pace of digital technology and giving them a multitasking advantage.

In the US, teenagers are spending 8.5 hours using computers, mobiles and other devices to learn, interact and play. This jumps to 11.5 if you take into account all of the _____ that goes on, such as talking on the phone while you’re watching TV. Australian teenagers were found to be spending an average of 7 hours and 38 minutes using these devices in 2009.

There are _____as to how social media is affecting the way in which the brain learns to _____ , as one of the most important skills that we learn as children is how to make friends and interact with people around you. Geidd says that from a biology standpoint, a lot of what goes on inside our brains is social.“A lot of the brain changes are sort of set up to develop these social skills. ” These interactions are now being _____ by technology—you could have hundreds of friends, all of whom are real people that you interact with—and scientists aren’t sure whether we’ll be able to develop the same _____using Facebook.

There is possible _____ of the growing digital trend: Youtube indicates that teenagers all over the world are watching the same clips and laughing at the same jokes, indicating that they are more _____ than their predecessors. Sharing the same jokes could possibly go a long way to breaking down some of the prejudices out there. They may be _____ to texting their friends and posting updates on Facebook, but teenagers today are probably going to have access to technology and _____ social and educational opportunities that anyone with a less flexible brain might have trouble imagining. _____, there is a cut off and by the age of 30, our brains become more set in their ways, making it harder for us to adapt and cope with new technologies.

1.A.activity B.capacity C.responsibility D.opportunity

2.A.operating B.promoting C.adjusting D.establishing

3.A.functions B.options C.restrictions D.positions

4.A.opposed B.imposed C.limited D.extended

5.A.keep up with B.come up with C.put up with D.end up with

6.A.entertaining B.multitasking C.interacting D.gossiping

7.A.curiosities B.criticisms C.concerns D.shortcomings

8.A.memorize B.internalize C.realize D.socialize

9.A.changed B.controlled C.troubled D.interrupted

10.A.attitudes B.prospects C.trends D.skills

11.A.advantage B.distraction C.indication D.tuition

12.A.narrow-minded B.global-minded C.absent-minded D.quick-minded

13.A.keen B.addicted C.obsessed D.enthusiastic

14.A.however B.hence C.moreover D.instead

15.A.Consequently B.Additionally C.Nevertheless D.Thus