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Motherhood may make women smarter and may help prevent dementia(痴呆) in old age by bathing the brain in protective hormones(荷尔蒙) , U.S.researchers reported on Thursday.
Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer’s(早老痴呆症).University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans.“Our research shows that the hormones of pregnancy(怀孕) are protecting the brain, including estrogen(雌激素), which we know has many neuroprotective (保护神经的) effects,” Kinsley said.
“It’s rat data but humans are mammals just like these animals are mammals,” he added in a telephone interview.“They go through pregnancy and hormonal changes.” Kinsley said he hoped public health officials and researchers will look to see if having had children protects a woman from Alzheimer’s and other forms of age-related brain decline.
“When people think about pregnancy, they think about what happens to babies and the mother from the neck down,” said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida.
“They do not realize that hormones are washing on the brain.If you look at female animals that have never gone through pregnancy, they act differently toward young.But if she goes through pregnancy, she will sacrifice her life for her infant—that is a great change in her behavior that showed in genetic alterations(改变) to the brain.”
【小题1】How do scientists know “Motherhood may make women smarter”?
A.Some researchers have told them.
B.Many women say so.
C.They know it by experimenting on rats.
D.They know it through their own experience.
【小题2】What does the phrase “litters of pups” mean in the second paragraph?
A.Baby rats.B.Animals.C.Old rats.D.Grown-up rats.
【小题3】What can protect the brain of a woman according to the passage?
A.Estrogen.
B.The hormones of pregnancy.
C.More exercise.
D.Taking care of children.
【小题4】“It’s rat data but humans are mammals just like these animals are mammals.” What does the sentence suggest?
A.The experiments on the rats have nothing to do with humans.
B.The experiments on the rats are very important for animals.
C.The experiments on the rats are much the same on humans.
D.The experiments on the rats are much the same on other animals.
【小题5】Which title is the best for this passage?
A.Do You Want to Be Smarter?
B.Motherhood Makes Women Smarter
C.Mysterious Hormones
D.An Important Study
12-13高三上·浙江杭州·阶段练习
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At Sho Farm in northern Vermont, farmers Melissa Hoffman and Shawn Smith work hand in hand with the land and its inhabitants, and among them are hundreds of ducks. The ducks at Sho Farm are not being raised to be killed for food. Rather, they are naturally involved in farming operations, helping to manage pests and add fertilizer (肥料) to the soil.

In the beginning, Hoffman, who has a background in organic farming and ecology action, worked with ecologists and biologists to survey the plants and wildlife all around the area. This was “to understand who was living here, so that everything we did was in relationship to the life already here,” he says.

So, at Sho Farm, focus is placed on living harmoniously alongside other life and working with traditional ecological knowledge. Food is seen not as a commodity (商品) but as a relationship with land and life.

The methods of food production at Sho Farm, as well as the farmers’ philosophy of working with rather than against nature, are in sharp contrast to most modern agricultural systems. And that’s the point. “We’ve been talking a lot about the broken food system and the consequences of it to the environment, to wildlife, to the animals in animal agriculture and to human health,” says Hoffman, adding that it’s not just the food system that’s broken. “It’s the relationship between humans, non-human animals, land and nature.”

The ducks play a vital, integrated role on the farm, explains Hoffman, by naturally providing pest control, fertilizer and (fuel-free) land maintenance (维护), just as by-products of their existence. “We noticed where we summered groups of ducks and parts of the food system that were not doing very well. The following year, the food system was efficiently improved,” he says.

It’s a symbiotic relationship that works well. “Animals don’t have to be part of a farm in a commodity sense. They can be part of the farm as a partner,” Hoffman says. “They are wonderful partners.”

【小题1】Why did Hoffman do a survey in the beginning?
A.To get familiar with the surroundings.
B.To have a good relationship with other people.
C.To live in harmony with other life on the farm.
D.To have a good understanding of organic farming.
【小题2】What does the author intend to explain in paragraph 4?
A.The causes of the broken food system.
B.The reasons for Hoffman’s farming methods.
C.The changes in modern agricultural systems.
D.The process of food production at Sho Farm.
【小题3】What does “a symbiotic relationship” in the last paragraph imply?
A.Animals are treated well at Sho Farm.
B.Animals are not to be sold for money.
C.People and animals play the same role in organic farming.
D.People and animals work together and benefit each other.
【小题4】Which of the following best describes the farming at Sho Farm?
A.Efficient.B.Modern.C.Natural.D.Economical.

Each fall, the flu emerges as a terrible force. 【小题1】 Influenza viruses cause millions of illnesses and thousands of deaths in the United States each year. So it’s necessary to know more about the flu viruses.

What’s the difference between Type A and Type B?

Influenza A viruses come in many varieties. Four subtypes commonly affect humans. But many more influenza A viruses have been identified in animals, which makes it a potential source of pandemics whenever a new type of influenza A jumps to humans. 【小题2】 They are divided into just two lineages (谱系) that cause seasonal outbreaks.

What are symptoms of an influenza infection?

If you do get sick with the flu, you’ll have common symptoms like fever, muscle aches and respiratory ailments. Most otherwise healthy people are sick for three to seven days. 【小题3】 The flu can also trigger inflammatory (炎症反应) responses in the body and worsen existing chronic conditions like asthma or heart disease.

【小题4】

Some rapid tests available at doctors offices can distinguish between influenza A and B, although they tend to have low sensitivity. Doctors can also order more sensitive P. C. R. tests to identify the specific flu virus causing infection.

How do you treat influenza?

To treat the flu, we can take approved antiviral medications that are commonly used to shorten the duration and severity of illness. Stay hydrated, get plenty of rest and use over-the-counter medications to reduce fever as needed. But if you develop a sustained fever of 39℃, you have difficulty breathing or you experience severe chest or stomach pain, it is important to seek medical attention immediately. 【小题5】

A.How do you get tested for influenza?
B.How do you know which type you have?
C.Influenza B viruses, however, only circulate in humans.
D.In some cases, the cough and fatigue can linger for two weeks.
E.These may be signs that you need a stronger influenza treatment.
F.There are two players every flu season: influenza Type A and Type B.
G.Public health officials recommend everyone six months and older get an annual flu shot.

In this entry to my blog series about successful multinational companies, I will check out the furniture chain IKEA. IKEA has been the world’s dominant furniture chain since 2008, according to Forbes magazine.

Swedish entrepreneur Ingvar Kamprad was only 17 years old when he started the company in 1943. These days, the chain has about 400 stores selling appliances, furniture and other household items in over 40 countries around the world. So how have they managed to become such a global hit, to me it seems that three features of the chain stand out: their dedication to research, their affordable prices and their eco-friendly reputation.

The executives of IKEA have long understood the need to research other markets in order to succeed globally. The company is constantly conducting research on how people use their furniture and what they are looking for. They recently conducted research in eight cities worldwide. This is how they learned, for example, that Korean customers want a special kimchif refrigerator.

But in order to sell at discount prices, they need to make and sell a lot of the same thing to keep costs low. This way, they can get low prices from suppliers, and charge super-low prices to their customers. As a result, they can keep their prices economical even during periods of inflation. This is why they will show the same products in different ways in their stores, depending on the local culture. A British bedroom display might have a British flag bedspread on it, whereas one in Tokyo may have a traditional mat on the floor. In China, IKEA’s fastest-growing market, domestic manufacturers make most of the products they sell in order to keep transport costs low.

A final selling point of the company is eco-friendly. A company representative recently said that they are working on creating new products out of materials we currently throw away, such as recycled plastic and foil. In some markets, they plan to market an electric bicycle, and in Seoul, they recently planted a tree to celebrate the opening of a new store.

Next week, I’ll look at other multinational companies which specialize in household goods and automobile production.

【小题1】What’s one of the following reasons contributing to IKEA popularity in the world?
A.The fashionable feature.B.The variety of furniture.
C.The devotion to study.D.The automobile design.
【小题2】How does IKEA sell products in low price?
A.By making all the products in China.
B.By adjusting the price in different periods.
C.By showing different products in the same way.
D.By producing and setting large amounts of the same products.
【小题3】Why does IKEA have an eco-friendly reputation?
A.It has made some electric bicycles.
B.It has planted some trees.
C.New products out of recycled materials are created.
D.It keeps transport cost low for most of the products.
【小题4】What’s the writer probably according to the passage?
A.A blogger.B.A reporter.C.A teacher.D.A salesman.

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