An allergy is a strong reaction to a substance. Many things can cause allergies. The most common cause is pollen (花粉), which is usually produced by trees in the spring, grasses in the summer and weeds in the fall, as part of their reproductive process.
Other causes include organisms, chemicals, plants and dead skin particles from dogs and cats can also cause allergic reactions. So can insect stings and some food.
The most common kind of allergic reactions is itchy (痒的) , watery eyes and a blocked or watery nose. Allergies can also cause red, itchy skin. Some reactions can be life-threatening, for example, when breathing passages become blocked.
It is not always easy to avoid allergies. Drugs may offer an effective treatment. Another treatment used in some cases is called immunotherapy. A patient is injected with small amounts of the allergy-causing substance. The idea is that larger and larger amounts are given over time until the patient develops resistance in his body.
In the United States, experts estimate that up to 8% of young children have food allergies. Every year these allergies cause about 30,000 cases with severe reactions that require immediate treatment. It can result in breathing trouble and in some cases death. It is said that about 100 to 200 people will die. It is said that most of the reactions are caused by peanuts and tree nuts like walnuts.
People can also be allergic to medicines. The American Academy of Allergy, Asthma and Immunology says about 10％ of bad reactions to commonly used medicines are allergic. In other words, a person’s immune system overreacts and produces an allergic reaction. The most common reactions include skin rashes, itching, breathing problems and swelling in areas such as the face.Allergies seldom occur in winter because ________.
| A．plants don’t usually flower in cold weather |
| B．people usually wear thick clothes |
| C．pollen is active below freezing point |
| D．the weather is too cold for viruses |
What will happen if one’s breathing passages get blocked?
| A．It is nothing serious. | B．One’s life is at risk. |
| C．One has to be sent to hospital. | D．One is sure to breathe easily. |
According to immunotherapy, the patient is supposed to________.
| A．take some medicines to produce antibodies |
| B．have immediate operations |
| C．be given the allergy-causing substance until the patient develops resistance |
| D．be exposed to enough allergy-causing substances |
The best title would be _______.
| A．The ABCs of Allergies | B．The Cause of Allergies |
| C．The Treatment of Allergies | D．The Prevention of Allergies |
Can you believe your eyes? A recent experiment suggests that the answer to that question may depend on your age.
Martin Doherty, a psychologist at the University of Stirling in Scotland, led the team of scientists. In this experiment, Doherty and his team tested the perception(观察力) of some people, using pictures of some orange circles. The researchers showed the same pictures to two groups of people. The first group included 151 children aged 4 to 10, and the second group included 24 adults aged 18 to 25.
The first group of pictures showed two circles alone on a white background. One of the circles was larger than the other, and these people were asked to identify the larger one. Four-year-olds identified the correct circle 79 percent of the time. Adults identified the correct circle 95 percent of the time.
Next, both groups were shown a picture where the orange circles, again of different sizes, were surrounded by gray circles. Here’s where the trick lies in. In some of the pictures, the smaller orange circle was surrounded by even smaller gray circles — making the orange circle appear larger than the other orange circle, which was the real larger one. And the larger orange circle was surrounded by even bigger gray circles — so it appeared to be smaller than the real smaller orange circle.
When young children aged 4 to 6 looked at these tricky pictures, they weren’t fooled — they were still able to find the bigger circle with roughly the same accuracy as before. Older children and adults, on the other hand, did not do as well. Older children often identified the smaller circle as the larger one, and adults got it wrong most of the time.
As children get older, Doherty said, their brains may develop the ability to identify visual context. In other words, they will begin to process the whole picture at once: the tricky gray circles, as well as the orange circle in the middle. As a result, they’re more likely to fall for this kind of visual trick.Doherty and his team of scientists did an experiment to evaluate .
| A．children’s and adults’ eye-sight |
| B．people’s ability to see accurately |
| C．children’s and adults’ brains |
| D．the influence of people’s age |
When asked to find the larger circle, .
| A．children at 6 got it wrong 79 % of the time with no gray ones around |
| B．only adults over 18 got it right 95% of the time with gray ones around |
| C．children at 4 got it right about 79 % of the time with gray ones around |
| D．adults got it right most of the time with gray ones around |
According to the passage, we can know that .
| A．a smaller orange circle appears bigger on a white background |
| B．an orange circle appears bigger than a gray one of the same size |
| C．a circle surrounded by other circles looks bigger than its real size |
| D．a circle surrounded by bigger ones looks smaller than its real size |
Visual context may work when children get older than .
| A．4 | B．6 | C．10 | D．18 |
Why are younger children not fooled?
| A．Because they are smarter than older children and adults. |
| B．Because older people are influenced by their experience. |
| C．Because people’s eyes become weaker as they grow older. |
| D．Because their brain can hardly notice related things together. |
阅读下面短文,并按照题目要求用英语回答问题.
Almost everybody in America will spend a part of his or her life behind a shopping cart（购物手推车）. They will, in a lifetime, push the chrome-plated contraptions many miles. But few will know—or even think to ask—who it was that invented them.
Sylvan N. Goldman invented the shopping cart in 1937. At that time he was in the supermarket business. Every day he would see shoppers lugging（吃力地携带） groceries around in baskets they had to carry.
One day Goldman suddenly had the idea of putting baskets on wheels. The wheeled baskets would make shopping much easier for his customers, and would help to attract more business.
On June 4, 1937, Goldman’s first carts were ready for use in his market. He was terribly excited on the morning of that day as customers began arriving. He couldn’t wait to see them using his invention.
But Goldman was disappointed. Most shoppers gave the carts a long look, but hardly anybody would give them a try.
After a while, Goldman decided to ask customers why they weren’t using his carts. “Don’t you think this arm is strong enough to carry a shopping basket?” one shopper replied.
But Goldman wasn’t beaten yet. He knew his carts would be a great success if only he could persuade people to give them a try. To this end, Goldman hired a group of people to push carts around his market and pretend they were shopping! Seeing this, the real customers gradually began copying the phony（假冒的） customers.
As Goldman had hoped, the carts were soon attracting larger and larger numbers of customers to his market. But not only did more people come—those who came bought more. With larger, easier-to-handle baskets, customers unconsciously bought a greater number of items than before.
Today’s shopping carts are five times larger than Goldman’s original model. Perhaps that’s one reason Americans today spend more than five times as much money on food each year as they did before 1937—before the coming of the shopping cart.The underlined words “chrome-plate contraptions” in Paragraph 1 refer to ______.
（No more than 3 words）What was the purpose of Goldman’s invention? （No more than 10 words）
Why was Goldman disappointed at first? （No more than 10 words）
Why did Goldman hire people to push carts around his market? （No more than 10 words）
What do you think of Goldman? Please give your reasons. （No more than 20 words）
The first time I remember noticing I remember noticing the crossing guard was when he waved to me as I drove my son to school. He1me with a puzzle ---- all because he waved to me like someone does2seeing a close friend. A big,3smile accompanied his wave. For the next few days I tried to4his face to see if I knew him. I didn't. Perhaps he had5me for someone else. By the time I contented myself with the6that he and I were strangers, we were greeting each other warmly every morning like old friends.
Then one day the7was solved. As I8the school he was standing in the middle of the road9his stop sign. I was in live behind four cars.10the kids had reached the safety of the sidewalk, he lowered his sign and let the cars11. To the first he waved and12in just the same way he had done to me over the last few days. The kids already had the window down and were happily waving their reply. The second car got the same13from the crossing guard, and the driver, a stiff-looking（表情刻板的） businessman, gave a brief, almost14wave back. Each following car of kids on their way to school15more heartily.
Every morning I continued to watch the man with16.So far I haven't seen anyone17to wave back. I find it interesting that one person can make such a（n）18to so many people's lives by doing one simple thing like waving and smiling warmly. His19armed the start of my day. With a friendly wave and smiling face he had changed the20of the whole neighbourhood.
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Want to be a happy married couple? Consider having kids．
A new study found that having children boosts happiness．And the more, literally, the merrier．
But unmarried couples shouldn’t expect to find greater happiness through child-raising．The study, published in the Oct．14 online edition of the Journal of Happiness Studies, suggests that having children has little or no effect on boosting happiness among couples who aren’t hitched(和谐)．
The findings contradict previous research that suggested that having more offspring doesn't lead to greater happiness and might even make people less satisfied with their lives．One theory behind the conclusion is that parents don’t receive many rewards in return for the hard work of raising children．
The new study, however, notes that parents say children are one of the most important things in their lives, if not the most important．
The study found that life satisfaction for married people -- women especially -- goes up the more kids they have．Single, separated and co-habiting people, by contrast, report negative experiences．
“One is tempted to advance that children make people rich under the ‘right conditions’ -- a time in life when people feel that they are ready, or at least willing, to enter parenthood,” Dr．Luis Angeles, of the University of Glasgow in Scotland, said in a news release from the journal’s publisher．“This time can come at very different moments for different individuals, but a likely signal of its approach may well be the act of marriage．”he underlined word “offspring” in the fourth paragraph can be replaced by _____．
| A．generation | B．children | C．mothers | D．marriage |
The best title of this passage should be _______．
| A．Children Are the Source of Happiness |
| B．Are You Happy Married Couple? |
| C．Married with Children Paves Way to Happiness |
| D．The Right Conditions of Having Children |
Which of the following can be inferred from the passage?
| A．The more children women have, the happier they are． |
| B．The more children the married women have, the more unsatisfied they become． |
| C．Raising kids can give any person happiness． |
| D．Without marriage, one woman had better not raise kids． |
In the passage, the underlined part ‘right conditions’ refers to _______．
| A．a time when the couple are ready and willing to become parents |
| B．the situation where the family is rich enough to raise a child |
| C．the situation where the couple are very happy |
| D．a time when the couple thinks raising children can boost happiness |
The surprising experiment I am about to describe proves that air is all aroud you and that it proves down upon you．Air pressure is a wonderful force．When you swim underwater, you can feel water push down your body．The air all around you does the same．However, your body is so used to it that you do not notice this ．The pressure is caused by a layer of air called the atmosphere．This layer surrounds the Earth , extending to about five kilometers above the Earth’s surface．
The following experiment is an easy one that you can do at home．But make sure that you are supervised , because you will need to use matches．Now for the experiment！
What you need
·A hard-boiled egg without the shell
·A bottle with a neck slightly smaller than the egg
·A piece of paper
·A match
Metheod
1) Check that the egg will sit firmly on the neck of the bottle．
2) Tear the paper into strips and put the strips into the bottle．
3) Light the paper by dropping a burning match into the bottle．
4) Quickly sit the egg on the neck of the bottle．
Result
Astonishingly,the egg will be sucked into the bottle．Your friends will be amazed when you show them the experiment．But be careful when you handle matches．
Why it happened
As the paper burns,it needs oxyen and uses up the oxygen(air) in the bottle．The egg acts as a seal in the neck of the bottle,so no more air can get inside ．This reduces the air pressure inside the bottle．The air pressure must equalize,so more air from outside must enter the bottle．The outside air pressure against the egg and then the egg is pushed into the bottle!The proves that air is all around and that it is pressing down on it．When you do the experiment, why need you a person beside you?
| A．You couldn’t place the egg on the bottle by yourself． |
| B．The egg needs to be shelled． |
| C．You need to use matches． |
| D．The bottle can’t sit firmly on the desk． |
The purpose of doing this experiment is to prove ______．
| A．air pressure is a wonderful force |
| B．water can push down your body when you swim underwater |
| C．the air pressure is not equalized around us |
| D．the earth is surrounded by a layer of air called the atmosphere |
How did the egg put into the bottle？
| A．The oxygen inside the bottle suckde the egg in． |
| B．It became solt without the shell． |
| C．The neck of the bottle was wide enough． |
| D．The outside air pressure forced it into the bottle． |
The passage is ______．
| A．an experiment report | B．a scientific story |
| C．a research report | D．an interesting novel |