文档介绍：2012年职称英语理工类
新增文章篇目
阅读理解(6篇)
第六篇 Making Light of1 Sleep
第十九篇 Graphene's Superstrength1
*第三+八篇"Life Form Found" on Saturn's Titan
*第四十篇 Teaching Math, Teaching Anxiety
+第四+五篇 Small But Wise
+第四十六篇Ants Have Big Impact on Environment as "Ecosystem Engineers"
注意:+表示A级文章;*表示B即文章;其他为C级文章;
第六篇 Making Light of1 Sleep
All we have a clock located inside our brains. Similar to your bedside alarm clock, your internal clock2 runs on a 24-hour cycle. This cycle,called a circadian rhythm,helps control when
you wake,when you eat and when you sleep.
Somewhere around puberty,something happens in the timing of the biological clock. The
clock pushes forward,so adolescents and teenagers are unable to fall asleep as early as they used to. When your mother tells you it's time for bed,your body may be pushing you to stay up3 for several hours more. And the ing from puter screen or TV could be pushing you to stay up even later.
This shift4 is natural for teenagers. But staying up very late and sleeping late can get your body's clock out of sync with the cycle of light and dark5. It can also make it hard to get out of bed in the morning and may bring other problems,too. Teenagers are put in a kind of a gray cloud6 when they don't get enough sleep,says Mary Carskadon,a sleep researcher at Brown University in Providence,RI7 .It affects their mood and their ability to think and learn.
But just like your alarm clock,your internal clock can be reset. In fact,it automatically resets
itself every day. How? By using the light it gets through your eyes.
Scientists have known for a long time that the light of day and the dark of night play important roles in setting our internal clocks. For years,researchers thought that the signals that synchronize the body's clock8 were handled through the same pathways that we use to see.
But recent discoveries show that the human eye has two separate light-sensing systems. One system allows us to see. The second system tells our body whether it