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1、Sport is not only physically challenging, but it can also be mentally challenging. Criticismfrom coaches, parents, and other teammates, as well as pressure to win can create an excessiveamount of _1_ or stress for young athletes. Stress can be physical, emotional, or psychologicaland research has in
2、dicated that it can lead to burnout. Burnout has been described as _2_ orquitting of an activity that was at one time enjoyable.The early years of development are _3_ years for learning about oneself. The sport settingis one where valuable experiences can take place. Young athletes can, for example,
3、 learn how to_4_ with others, make friends, and gain other social skills that will be used throughout their lives.Coaches and parents should be aware, at all times, that their feedback to youngsters can _5_affect their children. Youngsters may take their parents and coaches criticisms to heart and f
4、ind aflaw(缺陷) in themselves.Coaches and parents should also be _6_ that youth sport participation does not become workfor children. That outcome of the game should not be more important than the _7_ of learning thesport and other life lessons. In todays youth sport setting, young athletes may be wor
5、rying moreabout who will win instead of _8_ themselves and the sport. Following a game many parents andcoaches _9_ on the outcome and find fault with youngsters performances. Positive reinforcementshould be provided regardless of the outcome. Research indicates that positive reinforcement motivatesa
6、nd has a greater effect on learning that criticism. Again, criticism can create _10_ levels of stress, which can lead to burnout.AprocessBhighCenjoyingDanxietyEsettleFcautiousGcooperateHgreatlyIdroppingJhardlyKintenseLfocusMaspirationNcriticalOprocedure参考答案：1.D2.I3.N4.G5.H6.F7.A8.C9.L10.BHeres the T
7、otally Amazing Wonder Material That Could Revolutionize TechnologyA.In the technology industry,every new product or service seems to come with the promise that it is an innovation with the potential to change the world.Graphene(石墨烯)，a form of carbon，might actually do just that.B.“Graphene is a wonde
8、rful material，”Jeanie Lau，a professor of physics at the University of California at Riverside，told Fortune.“It conducts heat 10 times better than copper and electricity 100 times better than silicon，is transparent like plastic，extremely lightweight,extremely strong,yet flexible and elastic.In the pa
9、st decade，it has taken the scientific and technology communities by storm，and has become the most promising electronic material to supplement or replace silicon.”C.Graphene has already found its way into a number of compelling applications，Lau said.For instance，“since it is both transparent and elec
10、trically conductivetwo attributes rarely found in the same material in natureit has tremendous potential as the transparent electrode in monitors.displays;solar cells，and touch screens，”she explained.“Companies such as Samsung that invest heavily in this area have already secured patents，produced pr
11、ototypes，and are expected to bring products to market in a few years.”Wearable electronic devices，aviation components，broadband photodetectors(光电检测器)，radiation-resistant coatings，sensors，and energy storage are among numerous other areas of active research.Lau said.D.For many researchers and investor
12、s，the ultimate application is graphene-based transistors，the building blocks of modem electronics.But getting there may take some time.A child of graphiteE.First produced in a lab back in 2004，graphene is essentially a single layer of pure carbon atoms bonded together in a honeycomb lattice so thin
13、its actually considered two-dimensional.“We generally regard anything less than 10 layers of graphene as graphene;otherwise，its graphite，”said Aravind Vijayaraghavan，a lecturer in nanomaterials at the University of Manchester.F.Even“graphene”is a bit of an umbrella term.“To oversimplify,there are tw
14、o major types of graphene，”Michael Patterson，CEO of Graphene Frontiers，said.The first：“Nanoplatelets，”which are powders or flakes made from graphite.These have been around for a while and are“not really super-sexy,”Patterson said.“You mix them into polymers(聚合物)or inks or rubbers to make them conduc
15、tive.”In flake form，graphene is already on its way to becoming a commodity,Patterson added.The other typein sheet or film formis where graphenes biggest promise lies.Graphene sheets have“incredible potential for electronics，”Patterson said.In the near term，that potential may manifest in situations where the quantity requirements are“not that great”and where quality or conductivity doesnt have to be as high，such as in basic touch-screen applications，he said.Products that use graphene in this way could arrive to market in the next six to 1 2 months.G.Looking a little further out，graphene
