Some colors people see late at night could cause signs of the condition mental health experts call clinical depression(临床抑郁症). 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（仓鼠）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, at Ohio State University, 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 interruptions at all but they did mess up biological clock (生物钟) genes and they did show depressive sign but if they were in the dim red light, they did not.” 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. From the text we know that ________ made the hamster feel depressed.
| A．the amount of the water |
| B．the colour of the light |
| C．the loss of pleasure |
| D．the level of energy |
What was the purpose of the experiment on hamsters?
| A．To show how well they slept. |
| B．To see how much sugary water they drank. |
| C．To explain why they liked dark colours. |
| D．To find out what caused the depression on them. |
The author explains the clinical depression by _________.
| A．reporting an experiment process |
| B．presenting research data |
| C．setting down general rules |
| D．giving his own experience |
Where can we probably find the text?
| A．In a science magazine. |
| B．In a physics textbook |
| C．In a tourist guidebook. |
| D．In an official announcement. |
Below is a selection from a popular science book.
If blood is red, why are veins(静脉)blue?
Actually, veins are not blue at all. They are more of a clear, yellowish colour. Although blood looks red when it’s outside the body, when it’s sitting in a vein near the surface of the skin, it’s more of a dark reddish purple colour. At the right depth, these blood-filled veins reflect less red light than the surrounding skin, making them look blue by comparison.
Which works harder, your heart or your brain?
That kind of depends on whether you’re busy thinking or busy exercising. Your heart works up to three times harder during exercise, and shifts enough blood over a lifetime to fill a supertanker. But, in the long run, your brain probably tips it, because even when you’re sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it.
Why do teeth fall out, and why don’t they grow back in grown-ups?
Baby(or“milk”)teeth do not last long; they fall out to make room for bigger, stronger adult teeth later on. Adult teeth fall out when they become damaged, decayed and infected by bacteria. Once this second set of teeth has grown in, you’re done. When they’re gone, they’re gone. This is because nature figures you’re set for life, and what controls regrowth of your teeth switches off.
Do old people shrink as they age?
Yes and no. Many people do get shorter as they age. But, when they do, it isn’t because they’re shrinking all over. They simply lose height as their spine(脊柱)becomes shorter and more curved due to disuse and the effects of gravity(重力). Many(but not all)men and women do lose height as they get older. Men lose an average of 3~4 cm in height as they age, while women may lose 5 cm or more. If you live to be 200 years old, would you keep shrinking till you were, like 60 cm tall, like a little boy again? No, because old people don’t really shrink! It is not that they are growing backwards—their legs, arms and backbones getting shorter. When they do get shorter, it’s because the spine has shortened a little. Or, more often, become more bent and curved.
Why does spinning make you dizzy(眩晕的)?
Because your brain gets confused between what you’re seeing and what you’re feeling. The brain senses that you’re spinning using special gravity-and-motion-sensing organs in your inner ear, which work together with your eyes to keep your vision and balance stable. But when you suddenly stop spinning the system goes out of control, and your brain thinks you’re moving while you’re not!
Where do feelings and emotions come from?
Mostly from an ancient part of the brain called the limbic system. All mammals have this brain area—from mice to dogs, cats, and humans. So all mammals feel basic emotions like fear, pain and pleasure.But since human feelings also involve other, newer bits of the brain, we feel more complex emotions than any other animal on this planet.
If exercise wears you out, how can it be good for you?
Because our bodies adapt to everything we do to them. And as far as your body is concerned, it’s“use it or lose it”! It’s not that exercise makes you healthy; it’s more that a lack of exercise leaves your body weak and easily affected by disease. What is the color of blood in a vein near the surface of the skin?
| A．Blue |
| B．Light yellow |
| C．Red |
| D．Dark reddish purple |
Why do some old people look a little shrunken as they age?
| A．Because their spine is in active use. |
| B．Because they are more easily affected by gravity. |
| C．Because they keep growing backwards. |
| D．Because their spine becomes more bent. |
What is the main purpose of the selection?
| A．To give advice on how to stay healthy. |
| B．To provide information about our body. |
| C．To challenge new findings in medical research. |
| D．To report the latest discoveries in medical science. |
We’re always looking for well-written reviews of books, music, movies, television shows, websites, video games and other products. When writing a review, concentrate on exactly what you liked or didn’t like. Give examples of strengths and weaknesses, be descriptive and provide background information on an author, director, actor or musician, if possible. Find professional reviews in magazines or newspapers and see how reviewers deal with their topic, but be sure to express your own voice in your review.
Grammar Hint for Reviews: When describing a book, movie, album or anything else, use the present tense.
Book Reviews
Discuss an author’s technique, strengths and weaknesses instead of focusing on the plot. Does the story flow? Is there a strong sense of character and place? Did you stay up until dawn to finish it? Is it good reading for teenagers? What influence did it have on you and why? If you’ve read other books by the same author, discuss how this book compares.
Movie Reviews
Think of the major Oscar categories and consider the performances, music, lighting and setting, etc. Do these work together? Did some hold up while others didn’t? If the movie is based on a book, discuss whether one is better than the other and why. If the movie is a remake, compare the film to its original.
Remember that a well-written movie review should discuss strengths and weaknesses. Some readers may not have seen a movie yet, so don’t give away an exciting scene or the ending!
College Reviews
Begin by providing an overview of the college, including location, size and a description of the campus and/or dorm life. Think about all aspects of your college visit. What academic, athletic and after-class programs are available? What are the students like? What makes the college different from others? Every school has strengths and weaknesses. Be objective. Consider what the school has to offer and who might enjoy or benefit the most from attending there. When writing a review, you ________.
| A．cannot refer to any previous review |
| B．must express your own views and opinions |
| C．must provide some information about the author |
| D．needn’t give any examples to support your views |
Which aspects should be included in all three reviews?
| A．Strengths and weaknesses. |
| B．Plot and character. |
| C．Programs and scenes. |
| D．Location and description. |
Where can you probably find the passage?
| A．In a personal diary. |
| B．In an official report. |
| C．In a tourist guidebook. |
| D．In a popular magazine. |
Dear Mom, Clear My Calendar
September is around the corner, and some of us are already complaining about summer’s end. But parents have a special reason to do so. The end of summer means the start of school. And these days, planning a young child’s schedule is a big challenge. The challenge is no longer finding activities to fill a child’s day; it is saying no to the hundreds of options available. Our mailbox is filled with brochures urging us to sign our kids up for classes from cooking to martial arts(武术).
Educators are themselves discouraged by the number of special classes that many children attend. In the name of “enrichment,” three-year-olds not only go to preschool in the morning but study French or gymnastics after lunch. One teacher tells of a four-year-old asking for help in the toilet before hurrying off to tennis. Another teacher says that children sometimes hold on to her at pickup time. What happened to unstructured time?
A generous explanation is that we enjoy giving children opportunities we never had. The truth however is that many parents have doubts about how much time they spend away from their families. And one way to reduce this guilt is to believe that time spent in these classes is somehow more beneficial to children than the time we know we should be giving them ourselves.
David Elkind, an expert on children, suggests that the 1960s gave birth to the belief that earlier is better. Parents hope that early music lessons, for example will build a child’s confidence. The truth, however, is that any time children are asked to do too much, too soon, they are at greater risk for feelings of failure.
A child’s time does not have to be planned to be meaningful. Remember the lazy days of summer? Some children sleep late and play with the kids across the street until it’s time to come home for dinner. However, with the majority of mothers working, fewer children enjoy that idle (空闲的) time now.
Come September, children across the country will finish a full day of kindergarten, only to attend an after-school program until 6 P.M., when a working mom or dad comes to take them home. That’s too much for a five-year old. Finances, of course, do limit some parents. But let’s be honest with ourselves – our own busy schedules, whatever they involve, are no excuse for burdening a young child’s. The author holds that it’s a challenge to plan a schedule for a child mainly because _____.
| A．a child’s schedule is too complex |
| B．activities suitable for kids are limited |
| C．parents are stuck in numerous choices |
| D．children always say no to parents’ advice |
What the two teachers say in Paragraph 2 implies that _____.
| A．children love to stay at school |
| B．they are popular with children |
| C．children dislike after-school classes |
| D．after-school classes are of poor quality |
According to the author, what is the real reason for parents to send their children to after-school classes?
| A．Parents want to make up for their own regrets. |
| B．After-school classes develop children’s potential. |
| C．Parents have doubt about their own ability to guide children. |
| D．After-school classes give parents an excuse for being absent. |
Which of the following will the author probably agree with?
| A．For children’s benefits, the earlier the better. |
| B．Children’s spare time should be carefully designed. |
| C．Idle time for children is becoming a thing of the past. |
| D．Parents should be forgiven if they have a good reason. |
My grandmother Adele loved culture and was generous with its gifts. When I was a child, she took me to museums, restaurants, dances. She showered me with gifts from her travels around the world. But I can only remember her giving me one book—a book that, to this day, I have not read. She presented me with her own favorite childhood book: Hans Brinker. My grandmother was happy to share this book with me. She even decorated the title page with her proud writing.
I tried to read it. I adored reading, and would dive into a new pile of books from the library all at once. But something about Hans Brinker just wouldn’t let me in. The story was set in Holland, a long time ago. It felt dull and unfamiliar—even though I was a fan of classics of other times and places. I simply read the first pages over and over. I could not progress.
Standing on a bookshelf in our living room, the book was like something I avoided. It scolded me for not being interested, for not trying hard enough, for disappointing my grandmother.
The book started to fit in, almost forgotten, until Adele asked. Had I read it? Did I like it? Always determined, she wanted to know the answer. I would make some kind of excuse, feel bad, and open it again, hoping for a new reaction. The book weighed on me.
Years passed and finally Adele and I both accepted that I would never read Hans Brinker. Eventually I cleared the book from the shelf. The Hans Brinker experience led me to set a rule that I’ve lived by ever since: Do not ask about a book given as a gift. Don’t ask, despite your desire to discuss it to grow closer. The desire for such connection is what gives book-giving with special meaning—and increases the owner’s possibility to be a letdown.
Guilt is basically the same as for all gifts, though. If the giver doesn’t have the pleasure of seeing or hearing about the gift being enjoyed, and asks whether it is, then the owner—unless she can truthfully say “yes”—either has to admit to not liking the present, or else lie on the spot. Neither is pleasant. So, don’t ask. When the author was a kid, his grandmother ________.
| A．took him to travel around the world a lot |
| B．loved to take him to museums and stores |
| C．shared her childhood stories with him |
| D．gave him many gifts |
What does the author think about the book his grandmother gave him?
| A．Boring. |
| B．Interesting. |
| C．Puzzling. |
| D．Disappointing. |
The underlined sentence “The book weighed on me” in Paragraph 4 probably means _______.
| A．the book is too heavy for the author to carry |
| B．the author feels stressful facing the book |
| C．the book is full of powerful viewpoints |
| D．the author keeps reading the book |
The author learns from the Hans Brinker’s experience that never________.
| A．give others books as gifts |
| B．lie to people who give you gifts |
| C．get close to others through gifts |
| D．talk about the books given as gifts |
Using too much water or throwing rubbish into our rivers are clear ways that humans can put our water supply in danger ,but we also affect our water supply in less obvious ways.
You may wonder how paving(铺砌) a road can lead to less usable fresh water. A major part of the water we use every day is groundwater. Groundwater does not come from lakes or rivers .It come from underground. The more roads and parking lots we pave, the less water can flow into the ground to become groundwater.
Human activity is not responsible for all water shortages(短缺). Driver climates are of course more likely to have droughts(干旱)than areas with more rainfall, but in any case, good management can help to make sure there is enough water to meet our basic needs.
Thinking about the way we use water everyday can make a big difference, too. In the United States, a family of four can use 1.5 tons of water a day! This shows how much we depend on water to live, but there’s a lot we can do to lower the number.
You can take steps to save water in your home. To start with, use the same glass for your drinking water all day. Wash it only once a day .Run your dishwasher (洗碗机)only when it is full. Help your parents fix any leaks in your home. You can even help to keep our water supply clean by recycling batteries instead of throwing them away. Which of the following is most likely to lead to less groundwater?
| A．Using river water. |
| B．Throwing batteries away. |
| C．paving parking lots. |
| D．Throwing rubbish into lakes. |
What can be inferred from the text?
| A．All water shortages are due to human behavior. |
| B．It takes a lot of effort to meet our water needs. |
| C．There is much we can do to reduce family size. |
| D．The average family in America makes proper use of water . |
The last paragraph is intended to .
| A．show us how to fix leaks at home |
| B．tell us how to run a dishwasher |
| C．prove what drinking glass is best for us |
| D．suggest what we do to save water at home |
The text is mainly about .
| A．Why paving roads reduces our water |
| B．how much we depend on water to live |
| C．why droughts occur more in dry climates |
| D．how human activity affects our water supply |
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