山西沁水县2017高考英语阅读理解选练（2）
【科普知识型---阅读理解】
Doctors sometimes prescribe light therapy to treat a form of depression in people who get too little morning sun. But too much light at other time may actually cau such mood disorders. Longlasting exposure to light at night brings depression, a new study finds, at least in animals.
The new data confirm obrvations from studies of people who work night shifts, says Richard Stevens of the University of Connecticut Health Centre. Mood disorders join a growing list of problems, including cancer, obesity and diabetes—that can occur when light throws life out of balance by disturbing the biological clock and its timing of daily rhythms.
In the new study, Tracy Bedrosian and Randy Nelson of Ohio State University expod mice to normal light and dark cycles for four weeks. For the next four weeks, half of the mice remained on this schedule, and the rest received continuous dim light throughout their
night. Compared with mice expod to normal nighttime darkness, tho getting dim light at night lost their strong preference for sweet drinks，“a sign they no longer get pleasure out of activities they once enjoyed，” Bedrosian says.
In a cond test, mice were clocked on how long they actively tried to escape a pool of water. Tho expod to night lights stopped struggling and just floated in the water, a sign of “behavioural despair”，10 times as long as the mice that had experienced normal nighttime darkness. All symptoms of depression disappeared within two weeks of the mice returning to a normal lightdark cycle, the rearchers report. The scientists also could quash the behavioural symptoms by injecting (注射)the brains of animals with a drug that prohibits the activity of certain molecules linked with human depression. This finding further suggests that light at night may cau something related to depression.
Human studies linking nighttime light and mood disorders are important but can't easily detect molecular underpinnings (分子结构carry your bag怎么读)as animal studies can，says George Brainard of Thomas Jefferson University. The new work, he says, suggests that the change of the
biological clock by light at night can be “indiesan extremely powerful force in regulating biology and behaviour英联英语”．
ari1．After being expod to continuous nighttime light，the mice ________．
A．changed their preferences
B．escaped from the water more eagerly
C．remained active as before
D．showed less interest in their favourites
2．What does the underlined word onblur“quash” in Para. 4 probably mean?
A．Study. B．Predict. C．Ea. D．Cau.
3．We can learn from the last paragraph that ________．
A．light at night may have practical value
B．the biological clock is beneficial to humans
C．human mood disorders cannot be healed easily
D．human studies are more important than animal studies
4．What is the main idea of the passage?
2021高考作文全国一卷A．Nighttime light may foster depression.
B．A drug has been found to cure mood disorders.
C．The study on animals can be applied to humans.
D．Human biological clock can be controlled by light.
【要点综述】光照疗法可以治疗抑郁症，但是，新的研究表明长期暴露于夜晚的灯光也可带来抑郁症，这项研究至少在动物身上得到了验证。
1新视野大学英语读写教程第三册答案．D 细节理解题。根据“Compared with mice expod to normal nighttime darkness，t
ho getting dim light at night lost their strong preference for sweet drinks…”可知，那些在夜晚持续接受暗淡灯光的老鼠失去了对于甜饮料的浓厚喜好，即没有那么喜欢甜饮料了，故选D项。
2．C 词义猜测题。通过原文quash前面also可以断定，quash的意思等于前面一句话的意思，即症状消失了，故选ea“缓解，减轻”。
3．A 推理判断题。根据最后一句可知，灯光可以影响生物钟，生物钟的改变可以影响行为，故选择A项。
4．A 主旨大意题。根据文章首段“Doctors sometimes prescribe light therapy to treat a form of depression in people who get too little morning sun.But too much light at other time may actually cau such mood disorders.”可知，本文主要讨论nighttime light与mood disorder或depression的关系，故A项正确。
2014高考训练题
Last night's meteor(流星)shower left many people in the community dissatisfied and dem
anding answers. According to Gabe Rothschild, Emerald Valley's mayor, people gathered in the suburbs of the city, carrying heavy telescopes, expecting to watch the brightly burning meteors passing through the sky. What they found instead was a sky so brightened by the city's lights that it darkened the light of the meteors passing overhead.
“My family was so frustratedboisterous，” admitted town resident Duane Cosby.“We wanted to make this an unforgettable family outing, but it turned out to be a huge disappointment.”
Astronomers—scientists who study stars and planets—have been complaining about this problem for decades. They say that light pollution prevents them from eing objects in the sky that they could e quite easily in the past. They call on people and the government to take measures to fight against it.
There is yetnutshell a population besides professional and amateur star obrvers that suffers even more from light pollution. This population consists of birds, bats, frogs，snakes, etc. For example, outdoor lighting verely affects migrating (迁徙的)birds. According to the International Dar-Sky Association，“100 million birds a year throughout North America di
康贝中文网e in crashes with lighted buildings and towers.”
