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請根據短文內容，回答1~5題。
Making Light of Sleep
All we have a clock located inside our brains. Similar to your bedside alarm clock, your intemal clock 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 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 BrownUniversity. 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.
clock located inside our brains is similar to our bedside alarm clock because __________.
controls when we wake, when we eat and when we sleep
has a cycle of 24 hours
is a cycle also called circadian rhythm
can alarm any time during 24 hours
is implied in the second paragraph?
g children's biological clock has the same rhythm with that of the teenagers.
le after puberty begin to go to bed earlier due to the change of the biological clock.
dren before puberty tend to fall asleep earlier at night than adolescents.
agers go to bed later than they used to due to the light from the computer screen.
the third paragraph the author wants to tell the reader that __________.
is natural for teenagers to stay up late and get up late
ing up late has a bad effect on teenagers' ability to think and learn
ng puberty most teenagers experience a kind of gray cloud
is hard for teenagers to get out of bed in the morning
h of the following statements is NOT tree according to the fourth and fifth paragraphs?
biological clock resets itself automatically.
t gets through our eyes and resets our biological clock.
internal clock as well as the alarm clock can be reset automatically.
internal clock, like the alarm clock, can be reset.
rding to the last two paragraphs, what did the previous researchers think about the human eye's light-sensing system?
human eye had two light-sensing systems.
human eye had one light-sensing system.
human eye could sense the light of day more quickly than the dark of night.
human eye could reset our intemal clocks in accordance with the alarm clocks.
1.參考答案：B
參考解析： 細節題。題幹：大腦中的鐘與你床邊的鐘類似，因為__________。第一段第二句提供了答案，句中的your internal clock即指a clock located inside Our brains。故選B。
2.參考答案：C
參考解析： 推理題。題幹：第二段暗含了什麼意思?第二段主要告訴讀者過了青春期(puberty)，由於生物鐘節奏的變化，青少年(adolescents andteenagers)比以前要晚睡幾小時。所以C是該段所隱含的內容。
3.參考答案：B
參考解析： 細節題。題幹：第三段中，作者想告訴讀者__________ 。第三段的最後一句直接給出了答案。
4.參考答案：C
參考解析： 細節題。題幹：根據第四段和第五段所述，下列哪一個不正確?根據第四和第五段的內容可知，鬧鐘和生物鐘都可以重新設定時間，但生物鐘能通過眼睛接受的日光來自動調節生理節奏。所以A、B和D都是這兩段中所述內容，故C是正確選項。
5.參考答案：B
參考解析： 推理題。題幹：根據最後兩段的內容，以前的研究者如何看待人類眼睛的'光感系統?問題使用的是過去時，問的是研究者在最新發現(recent discoveries)之前對眼睛感光系統的認識。文中提到，眼睛所接受到的平衡生物鐘的光訊號同樣作用於人類的視覺系統，也就是說，研究者之前認為人類的眼睛只有一個感光系統。但最新發現卻是，人的眼睛有兩個感光系統。
