17．Some colors people see late at night could cause signs of clinical depression．That was the finding of a study that builds on earlier study findings．They show that individuals who live or work in low levels of light overnight can develop clinical depression．Doctors use the word"clinical depression"to describe severe form of depression．Signs may include loss of interest or pleasure in most activities，low energy levels and thoughts of death or suicide．
In the new study，American investigators designed an experiment that exposed hamsters（倉(cāng)鼠）to different colors．The researchers chose hamsters because they are nocturnal，which means they sleep during the day and are active at night．
The animals were separated into four groups．One group of hamsters was kept in the dark during their night-time period．Another group was placed in front of a blue light，a third group slept in front of a white light，while a fourth was put in front of a red light．
After four weeks，the researchers noted how much sugary water the hamsters drank．They found that the most depressed animals drank the least amount of water．
Randy Nelson heads the Department of Neuroscience at Ohio State University．He says animals that slept in blue and white light appeared to be the most depressed．"What we saw is that these animals didn't show any sleep uneasiness at all but they did mess up biological clock genes and they did show depressive sign while if they were in the dim（微弱）red light，they did not．"
Randy Nelson notes that photosensitive（感光）cells in the eyes have little to do with eyesight．He says these cells send signals to the area of the brain that controls what has been called the natural sleep-wake cycle．
He says there's a lot of blue in white light．This explains why the blue light and white light hamsters appear to be more depressed than the hamsters seeing red light or darkness．

25．Researchers use hamsters in the experiment becauseD．
A．they are similar to humans in dealing with colors
B．they are easy to observe and study
C．they are sensitive to colors like human beings
D．they are active at night and sleep during the day
26．What sign shows that the hamsters are being depressed？A
A．They drink less sugary water．
B．They don't sleep well．
C．Their eyesight becomes worse．
D．Their energy level becomes low．
27．Ctends to cause hamsters to be depressed．
A．Dim light 
B．Red light
C．Blue light 
D．Darkness
28．What can help people who work late at night to avoid being depressed？B
A．Not being exposed to dim red light when using computers．
B．Equipping their computer screens to put it more in the reddish light．
C．Living or working in low levels of light overnight．
D．Going to see doctors of clinical depression regularly for help．

分析 文章主要介紹的是一項(xiàng)科學(xué)研究．人們?cè)谏钜箍吹降囊恍╊伾軌蛞鹋R床沮喪的癥狀．研究發(fā)現(xiàn)，整夜在較暗的環(huán)境中生活或工作的人可能會(huì)表現(xiàn)出臨床沮喪．相關(guān)癥狀包括對(duì)活動(dòng)失去興趣和樂(lè)趣，精神不振和產(chǎn)生死亡或自殺念頭等．

解答 25．D細(xì)節(jié)理解題．根據(jù)第二段The researchers chose hamsters because they are nocturnal，which means they sleep during the day and are active at night．可知研究者使用倉(cāng)鼠，是因?yàn)樗鼈冊(cè)诎滋焖X(jué)，晚上卻出來(lái)活動(dòng)．故選D．
26．A細(xì)節(jié)理解題．根據(jù)第四段"…the researchers noted how much sugary water the hamsters drank．They found that the most depressed animals drank the least amount of water"可知研究人員發(fā)現(xiàn)，壓抑感最強(qiáng)的倉(cāng)鼠喝的糖水最少．故選A．
27．C推理判斷題．根據(jù)第五段中的"…animals that slept in blue and white light appeared to be the most depressed"．可知睡在藍(lán)光和白光里的倉(cāng)鼠看起來(lái)最壓抑；根據(jù)第五段中的"if they were in the dim（微弱）red light，they did not"可知在昏暗的紅光里，倉(cāng)鼠一點(diǎn)也看不出壓抑；根據(jù)第七段中的"This explains why the blue light and white light hamsters appear to be more depressed than the hamsters seeing red light or darkness"可知處在藍(lán)光中的倉(cāng)鼠比在黑暗里的倉(cāng)鼠也更加壓抑．故選C．
28．B推理判斷題．根據(jù)最后一段中的"This explains why the blue light and white light hamsters appear to be more depressed than the hamsters seeing red light or darkness"可知在紅光或黑暗中，倉(cāng)鼠的壓抑感表現(xiàn)得比藍(lán)光或白光中的倉(cāng)鼠少．由此可知，B項(xiàng)中的讓電腦屏幕多顯現(xiàn)出一些紅光的做法是可取的．故選B．

點(diǎn)評(píng) 本文考察學(xué)生的理解推斷能力以及細(xì)心程度，只要抓住文章的關(guān)鍵詞，采用尋讀的方法查找細(xì)節(jié)，就能找到正確答案．

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B．Most women under 34find it difficult to get married．
C．The school helps men and women while they are in love．
D．The number of men and women attending class is equal．
60．The undedincd part"Mr．or Mrs．Right"probably meansC．
A．a(chǎn) person with the family name"Right"
B．a(chǎn) person who is always right
C．the righi person one wants to marry    
D．the couple who never tell lies．

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