Have you ever walked outside thinking it was one temperature but quickly discove

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Have you ever walked outside thinking it was one temperature but quickly discovered it felt colder? That is because of the “wind chill” effect.
Wind chill is how cold people and animals feel when they are outside, not the actual temperature on the thermometer(温度计). It is based on how quickly your body loses heat when it is exposed to wind and cold. When the wind is strong, your body quickly loses heat, making the temperature of your skin drop.
When scientists first started calculating wind chill, they used research conducted in 1945 by explorers to Antarctica who measured how quickly water froze outside.
But water freezes faster than exposed skin, so the wind chill index based on that data wasn’t accurate.
In 2001, the US government began to measure wind chill more precisely by testing how quickly people’s skin froze.
Twelve volunteers were placed in a chilled wind tunnel. Equipment was stuck to their faces to measure the heat flow from their cheeks, forehead, nose and chin while they walked three miles per hour on a treadmill(跑步机).
The experiment revealed how quickly exposed skin can be damaged, particularly unprotected areas like your fingers, toes, the tip of your nose and your ear lobes. In fact, 40 percent of your body heat can be lost through your head! Signs you might have frostbite(冻疮) are when the skin turns white or pale and you lose feeling in that area.
The information collected from the volunteers helped scientists work out the math to compute wind chill. It involves wind speed and air temperature.
If, for example, the temperature outside is zero degrees Fahrenheit and the wind is blowing at 15 miles per hour, the wind chill is calculated at 19 degrees below zero. At that wind chill temperature, exposed skin can freeze in 30 minutes.
You can find a calculation table at www.nws.noaa.gov/om/windchill/index.shtml.
Experts advise in cold weather that you wear loose-fitting, lightweight, warm clothing, worn on top of each other. Air caught between the clothes will keep you warm. The best cold-weather coats have head coverings made of woven material that keep out water. So next time the temperature drops and you want to play outside, listen to your parents when they tell you to wrap up warm!
小题1: According to the text, wind chill _______.

A．means how fast exposed skin freezes

B．doesn’t affect your head as much as other body parts

C．changes according to the temperature on the thermometer

D．changes from person to person depending on their health

小题2: When might a person have frostbite according to the passage?

A．When his skin turns red and he loses feeling in that area.

B．When he is running faster and he is losing strength quickly.

C．When his face is exposed and quickly loses heat even indoors.

D．When his skin turns pale and he has no feeling in that area.

小题3: What factors influence wind chill?

A．A person’s body temperature and will speed.

B．Wind speed and a person’s strength.

C．Air temperature and wind speed.

D．The location and air temperature.

小题4: What can we conclude from the passage?

A．It was in 1945 that scientists first began to calculate wind chill.

B．Compared with water, people’s exposed skin freezes more slowly.

C．The wind chill index based on Antarctica data is considered a standard.

D．With the development of technology, many previous researches have been proven wrong.

答案

小题1:A
小题2:D
小题3:C
小题4:B

解析

文章讲述了“wind chill”现象，阐明了原理并介绍了相关的实验情况。
小题1:细节题。根据文章第二段内容可知答案为A。
小题2:推理题。根据文章第七段内容可知当裸露皮肤变白，该部分丧失知觉后就容易出现冻疮。
小题3:细节题。根据文章倒数第四段It involves wind speed and air temperature.可知C为正确答案。
小题4:细节题。根据文章第四段第一行But water freezes faster than exposed skin可知B为正确答案。

举一反三

When my daughter Kelsey was a child, she loved to join me in the garden. To 36 chaos(混乱)in my own garden beds, I provided her with a space of her own, so Kelsey’s Corner was born. There she was 37 to dig and plant as she wished. Over time, that small piece of land grew into a favorite place in the 38.
As she approached high school, Kelsey took her 39 off the garden. I didn’t 40 to accept this change. It seemed acceptable that something as boring as working in the dirt gave way to the mystery of a(n) 41 social life, so I began to take care of the space. Even so, I knew it always would be Kelsey’s Corner.
Now my daughter is eighteen and is in the 42 weeks of her high school career. Our mailbox is filled with college admission materials, 43 me that the world has come for this young lady and that she will soon answer its 44. Kelsey is looking forward to her wonderful college life 45 her mother and I are anxious about the coming life 46 our daughter around.
Kelsey’s Corner seems extremely deserted in this early spring 47 Kelsey’s leaving. One morning, when I 48 past Kelsey’s Corner, I noticed some green seedlings had 49 at the foot of some dead stalks(秆).
It’s 50 that life is a cycle. Kelsey’s leaving is 51 one point on the cycle. Now the life wheel will roll with Kelsey as she 52 into her adult life.
Let her live as she will and let her 53 when she can, and whether she comes alone or in 54, she will be welcome home. I’ll take care of Kelsey’s Corner faithfully. It will also cycle annually, rolling on towards a 55 stage of our lives, one that promises a rich harvest.

小题1:

A．defend

B．avoid

C．cover

D．tolerate

小题2:

A．willing

B．sorry

C．free

D．sure

小题3:

A．garden

B．family

C．corner

D．area

小题4:

A．emotion

B．awareness

C．mind

D．expectation

小题5:

A．wonder

B．support

C．realize

D．refuse

小题6:

A．attractive

B．peaceful

C．complex

D．changeable

小题7:

A．latest

B．last

C．beginning

D．former

小题8:

A．reminding

B．introducing

C．promising

D．ordering

小题9:

A．letter

B．cry

C．notice

D．call

小题10:

A．since

B．while

C．because

D．unless

小题11:

A．beyond

B．except

C．besides

D．without

小题12:

A．in spite of

B．in case of

C．because of

D．instead of

小题13:

A．imagined

B．wandered

C．performed

D．examined

小题14:

A．existed

B．planted

C．appeared

D．exposed

小题15:

A．doubtful

B．informal

C．probable

D．true

小题16:

A．only

B．rarely

C．always

D．seldom

小题17:

A．looks

B．moves

C．breaks

D．pulls

小题18:

A．return

B．recover

C．compete

D．join

小题19:

A．time

B．person

C．need

D．company

小题20:

A．strange

B．proper

C．different

D．common

题型：不详难度：| 查看答案

British paychologists have found evidence of a link between excessive(过度的) Internet use and depression, a research has shown.
Leeds University researchers, writing in the Psychopathology journal, said a small part of Internet users were classed as Internet addicts and that people in this group were more likely to be depressed than non-addicted users.
The article on the relationship between excessive Internet use and depression is from a questionnaire-based study of 1,319 young people and adults.
The respondents answered questions about how much time they spent on the Internet and what they used it for; they also complete the Beck Depression Inventory---a series of questions designed to measure the seriousness of depression.
The six—page report, by the university’s Institute of Psychological Science, said 18 of the people who complete the questionnaire were Internet addict.“Our research indicates that excessive Internet use is associated with depression, but what we don’t know is which comes first—are depressed people drawn to the Internet or does the Internet cause depression?” the article’s lead author Dr Catriona Morrison said.”What is clear is that, for a small part of people, excessive use of the Internet could be warning signal for depressive tendencies.”
The age range of all respondents was between 16 and 51 years, with an average age of 21.24. The average age of the 18 Internet addicts was 18.3 years. By comparing the levels of depression within this group to that within a group of 18 non—addicted Internet users, researchers found the Internet addicts had a higher chance of developing depression than non-addicts. They also discovered that addicts spent more time visiting sexually pleasing website, online gaming sites and online communities.
“The public speculation（推测）was further proved by this study. That’s to say, over-engaging in websites which serve to replace normal social function might be linked to psychological disorders like depression and addiction,” Morrison said.”We now need to consider the wider social influence of this relationship and clearly prove the effects of excessive Internet use on mental health.”
小题1:Internet addicts are people who ______ according to the passage.

A．use the Internet more than enough

B．feel depressed when using the Internet

C．seldom connect to the Internet

D．feel depressed without the Internet

小题2:What is confirmed by the study according to the passage?

A．Depression leads to excessive use of Internet

B．Depression results from excessive use of Internet

C．Excessive use of internet usually accompanies depression

D．Excessive use of internet is usually earlier to depression

小题3:It is thought by the public that online communities______.

A．can never replace normal social function

B．are intended to replace normal social function

C．are associated with psychological disorders

D．shouldn’t take the blame for psychological disorders

小题4:According to Dr Catriona Morrison, the public speculation________.

A．lacks scientific evidence	B．helps clarify their study
C．finds a theoretical basis	D．has little scientific value

题型：不详难度：| 查看答案

People say teenagers are no good. They make too much noise in shopping malls; they drive recklessly up and down America’s main streets; they carry chips on their shoulders as big as the Sears Tower. And at least some of the time those things are true. But we shouldn’t forget that there are hard moments in the life of a teenager too.
I watched such a moment not long ago at a woman’s funeral. I didn’t expect the event to affect me. Through much of the ceremony, in fact, I remained unmoved.
The teenage grandson stepped forward. With his very first deep breath, every heart in that church was achingly reminded of something we had all forgotten. Softly he began: “I want to share a few values that Nana taught me. She never failed to see light in any situation. When our family dog would truly attack her, what would Nana say? ‘oh, what beautiful barking that dog has!’ That was Nana. ”
“She was a strong woman who often lived in the shadow of my grandpa, who was a successful businessman in this city. But she was the one behind the scenes who provided the strength and support for my grandpa’s career,” he said, with a voice now trembling, “That was Nana’s way.”
Through a low sob, he continued, “Whenever she did anything worth recognition, you’d have to hear about it from a different source, because she was never one to show off.”
Finally, in a voice breaking free of sorrow, he looked up and said, “Nana taught me courage. She put up an incredible fight to the end, when she died peacefully, which is how she lived her life. That was Nana’s way, and I hope I can carry on in the same manner.”
There are no hearts as sensitive as those of teenagers, because everything is happening to them for the first time. The trouble with teenagers is that they haven’t learned to be controlled.
When that boy rose to speak about the woman who surely had been his truest and closest friend, his honest voice dragged each of us out into the open where we could no longer hide in the calm ceremony. He exposed us to the truth about this very real woman who believed in a boy who probably tried the patience of many adults. He reminded us that his grandmother was more than another dot on the chart of life and death.
All over again we felt those powerful losses crossing our own hearts, and we knew that when you say good-bye to something happy, something young in yourself. And that something never really returns, and the pain never really goes away.
小题1:In the first paragraph, the writer gave some examples to________ .

A．support his idea that young people are no good

B．introduce his point of view about young people

C．tell people every coin has its two sides

D．show young people often make mistakes

小题2:From the boy’s speech, we know _______ .

A．his grandmother had great influence on him

B．they had a dog which often attacked people

C．people had forgotten her until the boy appeared

D．his grandmother was so weak that she is always living in the shadow of his grandpa

小题3:Which of the following statements is true?

A．The boy ’s speech moved no one present at the funeral except the writer

B．The boy’s being good at expressing himself enabled him to draw everyone’s attention

C．The boy was too grieved to accept the fact that his grandmother had passed away

D．The writer didn’t expect the event would affect him

小题4:What words can best describe grandmother’s quality?

A．Weak, mild and modest

B．Easygoing, cautious and considerate

C．Sensitive and hard on others

D．Patient, optimistic, strong and helpful.

小题5:The passage tells the readers_______ .

A．facing certain bitter facts help young people to grow

B．young people have to control themselves

C．the adults should learn from the young

D．the adults should teach the young how to be brave

题型：不详难度：| 查看答案

When a tornado touched down in a small town nearby, many families were left completely destroyed. Afterward all the local newspapers carried many human-interest stories featuring some of the families who suffered the hardest.
One Sunday, a particular picture especially touched me. A young woman stood in front of an entirely shattered mobile home, a depressed expression twisting her features. A young boy, seven or eight years old, stood at her side, eyes downcast. Clutching (紧握) at her skirt was a tiny girl who stared into the camera, eyes wide with confusion and fear.
The article that went with the picture gave the clothing sizes of each family member. With growing interest, I noticed that their sizes closely matched ours. This would be a good opportunity to teach my children to help those less fortunate than themselves. I taped the picture of the young family to our refrigerator, explaining their difficulty to my seven-year-old twins, Brad and Brett, and to three- year-old Meghan.
“ We have so much. And these poor people now have nothing,” I said.“We’ll share what we have with them.”
I brought three large boxes down from the room upstairs and placed them on the living room floor. Meghan watched seriously, as the boys and I filled one of the boxes with canned goods and foods.
While I sorted through our clothes, I encouraged the boys to go through their toys and donate some of their less favorite things. Meghan watched quietly as the boys piled up discarded toys and games.
“I’ll help you find something for the little girl when I’m done with this,” I said.
The boys placed the toys they had chosen to donate into one of the boxes while I filled the third box with clothes. Meghan walked up with Lucy, her worn, faded, much-loved rag doll hugged tightly to her chest. She paused in front of the box that held the toys, pressed her round little face into Lucy’s flat, painted-on-face, gave her a final kiss, then laid her gently on top of the other toys.
“Oh, Honey,” I said.“You don’t have to give Lucy. You love her so much.”
Meghan nodded seriously, eyes glistening with held-back tears. ‘”Lucy makes me happy, Mommy. Maybe she’ll make that other little girl happy, too．”
Swallowing hard, I stared at Meghan for a long moment, wondering how I could teach the boys the lesson she had just taught me. For I suddenly realized that anyone can give their cast-offs away. True generosity is giving that which you value most.
Honest benevolence (善行) is a three-year-old offering a valuable, though shabby, doll to a little girl she doesn’t know with the hope that it will bring this child as much pleasure as it brought her. I, who had wanted to teach, had been taught.
The boys had watched, open-mouthed, as their baby sister placed her favorite doll in the box. Without a word, Brad rose and went to his room. He came back carrying one of his favorite action figures. He hesitated briefly, clutching the toy, then looked over at Meghan and placed it in the box next to Lucy.
A slow smile spread across Brett’s face. Then he jumped up, eyes twinkling as he ran to fetch some of his prized Matchbox cars.
Astonished, I realized that the boys had also recognized what little Meghan’s gesture meant. Swallowing back tears, I pulled all three of them into my arms.
Taking the cue from my little one, I removed my old jacket from the box of clothes. I replaced it with the new hunter green jacket that I had found on sale last week. I hoped the young woman in the picture would love it as much as I did.
It’s easy to give that which we don’t want any more, but harder to let go of things we cherish, isn’t it? However, the true spirit of giving is to give with your heart..
小题1:Why does the author give a detailed description of a particular picture in the Sunday newspaper?

A．To create an atmosphere of fear and depression brought by the tornado.

B．To appeal to unconcerned people to donate for the poor families.

C．To show the helplessness and hopelessness of the family mentioned in the paper.

D．To stress what touched her and made her decide to help the hopeless family.

小题2:Why did Brad and Brett also donate their favorite things finally?

A．They were encouraged to donate some valuable things by the mother.

B．Meghan’s decision inspired them to donate their favorite things.

C．They also wanted to show generosity by giving away their valuable things.

D．Meghan’s gesture reminded them to replace their favorite things with new ones.

小题3:By “ swallowing hard”, the writer means that _ _ .

A．she was deeply puzzled by what the little girl did

B．she had trouble persuading Meghan not to give away Lucy

C．she was greatly moved by Meghan’s unexpected decision

D．she was uncertain what consequences Meghan’s action would bring about

小题4:It is suggested in the sentence “the true spirit of giving is to give with your heart” that ______.

A．sincere donation means offering help to others whole-heartedly

B．true giving means giving others what you treasure most

C．true generosity means helping others at the cost of your own benefit

D．honest benevolence means devoting yourself to the career of donation

小题5:What’s the best title for this passage?

A．The Greatest Love	B．A Beautiful Heart
C．True Generosity	D．A Precious Gift

题型：不详难度：| 查看答案

I live in the land of Disney, Hollywood and year-round sun. You may think people in such a splendid, fun-filled place are happier than others. If so, you have some mistaken ideas about the nature of happiness.
Many intelligent people still equate happiness with fun. The truth is that fun and happiness have little or nothing in common. Fun is what we experience during an act. Happiness is what we experience after an act. It is a deeper, more lasting emotion.
Going to an amusement park or ball game, watching a movie or television, are fun activities that help us relax, temporarily forget our problems and maybe even laugh. But they do not bring happiness, because their positive effects end when the fun ends.
I have often thought that if Hollywood stars have a role to play, it is to teach us that happiness has nothing to do with fun. These rich, beautiful individuals have constant access to glamorous parties, fancy cars, expensive homes, everything that spells“happiness”. But in memoir（回忆录）after memoir, they reveal the unhappiness hidden beneath all their fun: depression, alcoholism ,drug addiction, broken marriages, troubled children and profound loneliness.
Ask a bachelor why he resists marriage, if he’s honest, and he will tell you that he is afraid of making a commitment, for commitment is in fact quite painful. The single life is filled with fun, adventure and excitement. Marriage has such moments, but they are not its most distinguishing features.
Similarly, couples that choose not to have children are deciding in favor of painless fun over painful happiness. They can dine out whenever they want and sleep as late as they can. Couples with infant children are lucky to get a whole night’s sleep or a three-day vacation. I don’t know any parent who would choose the word fun to describe raising children.
Understanding and accepting that true happiness has nothing to do with fun is one of the most liberating（解放性的）realizations. It liberates time: now we can devote more hours to activities that can genuinely increase our happiness. It liberates money: buying that new car or those fancy clothes that will do nothing to increase our happiness now seems pointless. And it liberates us from envy: we now understand that all those rich and glamorous people we were so sure are happy because they are always having so much fun actually may not be happy at all.
小题1:We can learn from the passage that ________.

A．fun creates long-lasting satisfaction

B．fun provides enjoyment while pain leads to happiness

C．happiness is lasting whereas fun is short-lived

D．fun that is long-standing may lead to happiness

小题2:To the author, the role Hollywood stars play is to ________.

A．write memoir after memoir about their happiness

B．tell the public that happiness has nothing to do with fun

C．teach people how to enjoy their lives

D．bring happiness to the public instead of going to parties

小题3:In the author’s opinion, marriage ________ .

A．affords greater fun	B．leads to raising children
C．indicates duty and devotion	D．usually ends up in pain

小题4:Which of the following is the best example of“painful happiness”?

A．Winning lottery by accident

B．A bachelor resisting marriage

C．Raising children

D．Buying some fancy clothes

小题5:If one gets the true sense of happiness, he will ________.

A．stop playing games and joking with others	B．keep himself with his family
C．give a free hand to money	D．use his time to increase happiness

题型：不详难度：| 查看答案