根据下列材料，回答题。MakingLightofSleepAllwehaveaclocklocatedinsideourbrains．Similart

共享题干题根据下列材料，回答题。 Making Light of Sleep All we have a clock located inside our brains．Similar to your bedside alarm clock，your internal clock runs on a 24-hour cycle．This cycle，called a circadian(昼夜节奏的，生理节奏的)rhythm，helps control when you wake，when you eat and when you sleep． Somewhere around puberty(青春期)，something happens in the timing of the biological clock．The clock pushes forward，so adolescents(青少年的)and teenagers are unable to fall asleep as early as they used t0．When your mother tells you it’s time for bed，your body may be pushing you to stay up for several hours more．And the light coming from your computer screen or TV could be pushing you to stay up even later． This shift 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 dark．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 cloud when they don’t get enough sleep，says Mary Carskadon，a sleep researcher at Brown University in Providence，Rl 7．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 clock 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’s day or night． 1.[不定向选择题]According to the last two paragraphs，what did the previous researchers think about the human eye’s light—sensing system?A.The human eye had two light—sensing system B.The human eye had one light—sensing syste C.The human eye could sense the light of day more quickly than the dark of nigh D.The human eye could reset our internal clocks in accordance with the alarm clock 2.[不定向选择题]In the third paragraph the author wants to tell the reader that______．A.it is natural for teenagers to stay up late and get up late B.Staying up late has a bad effect on teenagers’ability to think and learn C.during puberty most teenagers experience a kind of gray cloud D.it is hard for teenagers to get out of bed in the morning

1.参考答案：B
参考解析：题干：根据最后两段，以前的研究者是如何看待人类眼睛的光感系统?A、人类眼睛有两套光感系统。B、人类眼睛有一个光感系统。C、比起夜晚的光线，人类眼睛能更快感知到白天的光线。D、人类眼睛能根据闹钟来重新设置我们体内的生物钟。细节题。问题使用的是过去时，问的是研究者在最新发现(recent discoveries)之前对眼睛感光系统的认识，即，the signals that synchronize the body’S clock were handled through the same pathways that we use to see(眼睛所接受到的平衡生物钟的光信号同样作用于人类的视觉系统)，也就是说，研究者之前认为人类的眼睛只有一个感光系统。但最新发现却是，人的眼睛有两个感光系统。
2.参考答案：B
参考解析：题干：第三段作者想告诉读者——。A、青少年晚睡晚起是很自然的B、熬夜对青少年的思考和学习能力有不好的影响C、大多数青春期的少年会经历一种灰色的云样的气质D、早晨青少年起床是很困难的事情细节题。第三段在分析熬夜如何对青少年产生影响，最后一句直接给出了答案：会影响学习和思考的能力。故本题选B。3.[不定向选择题]What is implied in the second paragraph?A.Young child ren’s biological clock has the same rhythm with that of the teenager B.People after puberty begin to go to bed earlier due to the change of the biological cloc C.Children before puberty tend to fall asleep earlier at night than adolescent D.Teenagers go to bed later than they used to due to the light from the computer Screen.?

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