Did you know that women’s brains are smaller than men’s? The average women’s brain weighs 10% less than men’s．Since research has shown that the bigger the brain, the cleverer the animal, men must be more intelligent（聪明的） than women．Right? Wrong．Men and women always score similarly on intelligence tests, despite the difference in brain si
ze．Why? After years of study, researchers have concluded that it’s what’s inside that matters, not just the size of the brain．The brain consists of “grey matter” and “white matter”．While men have more of the latter, the amount of “thinking” brain is almost exactly the same in both sexes．
It has been suggested that smaller brain appears to work faster, perhaps because the two sides of the brain are better connected in women．This means that little girls tend to learn to speak earlier, and that women can understand sorts of information from different sources at the same time．When it comes to talking to the boss on the phone, cooking dinner and keeping an eye on the baby all at the same time, it’s women who come out on top every time．
There are o
ther important differences between two sexes．As white matter is the key to spatial（空间的） tasks, men know better where things are in relation to other things．“A great footballer always knows where he is in relation to the other players, and he knows where to go,” says one researcher．That may explain one of life’s great mysteries: why men refuse to ask for directions…and women often need to!
The differences begin when fetuses（胎儿） are about nine weeks old, which can be seen in the action of children as young as one．A boy would try to climb a barrier （障碍物） before him or push it down while a girl would attract help from others．These brain differences also explain the fact that more men take up jobs that require good spatial skills, while more women speech skills．It may all go back to our ancestors（祖先）, among whom women needed speech skills to take care of their babies and men needed spatial skills to hunt, according to one research．
If all this disappoints you, it shouldn’t．“The brain changes throughout our lives according to what we do with it．” says a biologist．The passage mainly tells us ________．
A．the difference between men’s and women’s brains |
| B．the changes in brain throughout our lives |
| C．that men are better at spatial tasks |
| D．that brain differences are related to our ancestors |
Which of the following is true according to the first paragraph?
| A．Women’s brain is 10% less than men’s |
| B．Grey matter plays the same role as white matter． |
| C．Grey matter controls thinking in the brain． |
| D．Both sexes have the same amount of white matter． |
What can we infer from the second and third paragraphs?
| A．Women prefer doing many things at a time． |
| B．Men do better dealing with one job at a time． |
| C．Women do not need to tell directions． |
| D．Men have weaker spatial abilities． |
Which of the following do you agree with according to the fourth paragraph?
| A．Young boys may be stronger than young girls． |
| B．More women take up jobs requiring speech skills |
| C．Women may have stronger feelings than men． |
| D．Our ancestors needed more spatial skills． |
What is the writer’s attitude in writing this passage?
| A．Defensive． | B．Persuasive． | C．Supportive． | D．Objective． |
My 16-year-old son, Anton, had gone to the local swimming hole． Most of the kids swim there, and there are plenty of rocks for them to use as safe harbors, so I had no fears for his safety．
Still, the firefighter's first words "You need to come up here to the Stillwater River" made me catch my breath, and his follow-up words gave me relief: “ Your son is OK．”
When I got to the river, I immediately saw the firetruck, ambulance and Anton, wrapped with a towel about his shoulders, sitting quietly on a low platform of the fire engine．
I hurried over to him． "You OK?"I asked．
”Yeah," was all he said． But my eyes begged for an explanation, I didn't get it from my son, however, who tends to play his cards close to his vest．
The story was this: A woman was being swept under water． Hearing the cries, Anton and his friend Tyler, without hesitation, swam out to her, and brought her safely to shore．
In an age in which the word "hero" is broadcast with abandon and seemingly applied to anyone who make it through the day, I realized the real thing in my son． The teens are stubborn and self-centred, but that didn't mean they have no desire to do good．
Still shocked by my son's daring, I drove him home． Along the way, I tried to dig out some more information from him - but he had precious little to say． The only words he said were,
”What's for supper?"
I spent some time alone that evening, thinking about the tragedy that might have been． The next morning, when Anton got up, I half expected him to tell me the story． But all he did was toast some bread, pull himself together, and head for the door to start a new day． Watching from the window,1 was reminded that still water often runs deep．Why did the mother allow her son to swim there?
| A．He was an excellent swimmer． |
| B．The water of the river is shallow． |
| C．He was old enough to swim． |
| D．The rocks can be of help if there's danger． |
The underlined part "who tends to play his cards close to his vest" probably means
| A．Anton is a boy fond of swimming with other kids |
| B．Anton is unwilling to tell others what he thinks |
| C．Anton always has a desire to help others |
| D．Anton seldom changes his mind |
In the mother's eyes, what her son did was
| A．dangerous but interesting |
| B．unexpected and courageous |
| C．meaningful but difficult |
| D．awful and absurd |
What might be the best title for the passage?
| A．My Son, My Hero | B．Anton, A Silent Boy |
| C．A Good Deed | D．A Proud Mother |
Up to two-fifths of a food crop is often wasted because it is “ugly”, a report on food waste has shown.
Produce grown in the UK that does not meet retailer(零售商) standards on appearance is often given to animals or thrown out even though it is healthy to eat.
The report from the UK’s global food security program also showed that the average household throws away more than 5kg of food a week, and nearly two-thirds of that waste is avoidable.
The waste costs £ 480 a year per household on average, and £ 680 per family.
Households throw away a fifth of the food they buy, wasting it for reasons ranging from cooking too much to not using it before it goes bad, the study showed.
Consumption is the top area where food is wasted in the UK, the study said.
Farmers respond to consumer demands for high-quality food with standards that can lead to the crop being wasted. Some supermarkets have started marketing “odd shapes and sizes” of fruit and vegetables, though.
Also, more UK consumers are prepared to accept “ugly” fruit and vegetables, amid concerns over sustainability(可持续发展) and food prices, the research said.
In developing countries, much of the loss of food occurs during post-harvesting storage, processing and packaging.
Tackling waste globally is necessary to feed a growing world population sustainably. One in eight people worldwide doesn’t have enough food, the report said.
Around a third of food produced globally is lost or wasted.
Professor Tim Benton, an expert on food security at the University of Leeds, said: “Over 5 million people in the UK live in poverty, where basic food provision is a daily challenge.”
Nearly 400,000 people used food banks last year, according to the Trussell Trust.
“At the same time, 15 million tons of food is wasted annually, with nearly half thrown away within UK households. Reducing the scale(范围) of losses and waste throughout the food system is a crucial step.”
The report highlights priorities(优先事项) for research to help reduce food waste, including improving harvesting and packaging technologies and seasonal weather prediction.
Food waste in developing nations is mainly due to .
| A．fast growing populations |
| B．huge demand for high-quality foods |
| C．poor technology in food industries |
| D．people’s lack of concern about food shortages |
We can conclude from the article that .
| A．over half of the food produce in the UK is wasted within households |
| B．“ugly” fruits and vegetables are becoming more and more popular in the UK |
| C．avoiding food waste could, by itself, solve food shortage problems around the world |
| D．developing better farming and packaging technologies is key to reducing food waste |
Which of the following statements might Professor Tim Benton agree with?
| A．British farmers should keep up with their high growing standards. |
| B．The number of people living in poverty is growing too fast in Britain. |
| C．There is still much to do to improve British people’s awareness of food sustainability. |
| D．British supermarkets should be encouraged to sell food of odd shapes and sizes. |
What is suggested in the report?
| A．Cutting food prices. |
| B．Using different approaches to reduce food waste. |
| C．Improving the appearance of food. |
| D．Cooking at home more often. |
Here is a task for you: try to make as many kinds of facial expressions as you can. How many can you come up with?
Facial expressions are like a window to your emotions inside. Scientists used to believe that we only have six basic emotions-happy, sad, fearful, angry, surprised and disgusted-and ,therefore, each of our facial expressions falls into one of the six categories.
But it turns out that this is just the tip of the iceberg. In a recent study, scientists from Ohio State University, US, mapped 21 different facial expressions, more than tripling(是……的三倍) the original number, reported Science Daily.
Restricting emotions to just six categories is like “painting only using primary colors”, said Aleix Martinez, the lead researcher. He believed that human emotions are much richer than that, which is why he and his team decided to use advanced computer technology for further investigation.
In the experiment, scientists photographed 230 volunteers-100 male and 130 female-while they made faces in response to different words such as “you smell a bad odor(气味)”. They then closely studied the images by examining key muscles on volunteers’ faces, such as the corners of the mouth or the outer edge of the eyebrow, and finally identified 21 different expressions. These included what seem to be contradictory emotions such as “happily disgusted” and “sadly angry”, which scientists call “compound(混合的) emotions”.
Take “happily disgusted” as an example.” Putting on a happy face is usually done by drawing up the cheeks and smiling while a disgusted face often involves a scrunched-up(皱起的) nose and eyes. So the “happily disgusted” emotion created an expression that combined the smile of happy with the scrunched-up eyes and nose of disgusted. It was the emotion test subjects felt when something “gross(恶心的)” happened that was also funny-for example, when people spill(洒出) a lot of food on their clothes.
Similarly, “happily surprised” is an expression for receiving unexpected good news. “Sadly angry” is the face we make when someone we care about makes us angry.
According to Martinez, the researchers’ next step is to study the pathways and chemicals in the brain that activate(激活) and recognize those emotions. He believes that this could lead to effective treatments for people who suffer from conditions such as Post-Traumatic Stress Disorder(PTSD,创伤后应激障碍), which involves a lack of recognition of other people’s emotions.The underlined part “this is just the tip of the iceberg” in Paragraph 3 probably means .
| A．this is a truth known to us all |
| B．this is the total amount of something |
| C．this is easily seen or discovered |
| D．this is only the smallest and most obvious part of something |
How does the author explain the definition of “compound emotions” in the article?
| A．With comparisons. |
| B．Through examples. |
| C．Through cause and effect analysis. |
| D．By presenting research findings. |
According to the article, people are likely to become happily disgusted when .
| A．they receive unexpected good news |
| B．someone they don’t care about makes them happy |
| C．something unpleasant but also funny happens |
| D．they successfully escape from a dangerous situation |
What can we conclude from the article?
A. There are several contradictory emotions we tend to overlook.
B. Females have more contradictory emotions than males do.
C. The chemicals in the brain that activate emotions are easy to identify.
D. Martinez’s next goal is to find an effective cure for people who suffer from PTSD.
Everyone has those nights-you lie in your bed for hours, tossing and turning, totally unable to fall asleep. You wish you could just turn your brain off as if it were a light. That would make things much easier, wouldn’t it?
Now it looks like you are one step closer to this wild dream of yours-scientists from Oxford University, UK have just discovered the “switch” that tells the brain to go to sleep, reported Forbes.
To understand the study, you first need to know that there are two mechanisms(机能) that regulate sleep. There’s one that we’re already familiar with —our body clock, which works in a 24-hour cycle based on the light changes throughout the day.
The other one is what scientists call the sleep “homeostat(动态平衡系统)”. This mechanism has nothing to do with daylight. Instead, it keeps track of the brain’s waking hours and urges it to rest if it has been awake for a long time. “It is similar to the thermostat(自动调温器) in your home. A thermostat measures temperature and switches on the heating if it’s too cold,” Professor Gero Miesenbock, who led the study, told The Telegraph.
Our bodies use both of the mechanisms to regulate sleep. “The body clock says it’s the right time, and the sleep thermostat has built up pressure during a long waking day,” explained Miesenbock.
There is no way that scientists can trick the body clock. But with the sleep homeostat, there might be something they can do.
The researchers found that the sleep homeostat works by activating a specific group of nerve cells, or neurons, in the brain. They tested their theory on fruit flies by removing the neurons from the insects’ brains. And as expected, they found that the flies without the homeostat neurons did not keep a regular sleep pattern anymore.
Now that scientists have pinpointed the exact place in the brain— or, the “switch”—that regulates sleep, they can begin investigating how to activate these cells at any given time so that people can be sent to sleep instantly.
More importantly, figuring out how sleep mechanisms work may also help us to one day unravel one of the oldest mysteries of all: why do we need to sleep in the first place?
What is the article mainly about?
| A．A new way to treat sleep disorders. |
| B．The discovery of the sleep “homeostat” |
| C．Advice on what to do when you fail to fall asleep. |
| D．A comparison of the two mechanisms that regulate sleep. |
How does the author explain the function of the sleep homeostat?
| A．Through examples. |
| B．With comparisons. |
| C．Through cause and effect analysis. |
| D．By presenting research findings. |
What can we conclude from the article?
| A．Generally, the sleep homeostat has less effect on people during the day than at night. |
| B．There is little scientists can do to affect the way the sleep homeostat works. |
| C．What makes us go to sleep at night is probably a combination of the two mechanisms. |
| D．The more homeostat neurons there are in one’s brain, the more easily one can fall asleep. |
The underlined word “unravel” in the last paragraph is closest in meaning to .
| A．put up with | B．figure out |
| C．keep track of | D．take notice of |
Big Blue Whale
Nicola Davies
Illustrated(为……作插图) by Nick Maland
Nicola Davies provides a look at nature’s largest living creature in Big Blue Whale. The text often uses examples from the child’s world to help youngsters understand this great creature. For example, the blue whale’s skin is “smooth like a hard-boiled egg” and its eye is “big as a teacup”. Nick Maland’s pen-and-ink illustrations capture the majesty of the blue whale, of which only 10,000 remain.
Ages 3 to 8, $ 19.99.
Life in the Coral Reef
Bobbie Kalman & Niki Walker
Photographed by Tom Stack
This educational book has outstanding photographs and illustrations. The bright colors are attention grabbing. The importance of the coral reefs(珊瑚礁) in the ecology of the earth is explained as well as how the coral reefs are being harmed and destroyed. The author then offers solutions and suggestions to help prevent the destruction of these beautiful natural resources.
Ages 7 up, $ 16.95.
North American Endangered Species
Colleayn O. Mastin
Illustrated by Jan Sovak
This is a beautifully illustrated book by the award winner Jan Sovak featuring fifteen North American animals that are in danger of becoming extinct. Each animal is introduced with a short poem, followed by factual information and why the species is considered to be endangered.
Ages 6 up, $ 9.95.
Whale
Vasilli Papastavrou
Photographed by Frank Greenaway
This reference book takes a close look at the fascinating world of majestic sea mammals including whales, dolphins, seals, and sea lions. The author describes how whales adapt to sea life and explores whale communication, socialization, behaviors and reproduction, life cycles, habitats and physical characteristics.
Ages 10 up, $ 19.00.What do we learn from Big Blue Whale?
| A．The number of the blue whale is increasing. |
| B．Many animals are in danger of dying out. |
| C．There used to be more than 10,000 blue whales. |
| D．The blue whale has strong survival abilities. |
What is special about North American Endangered Species?
| A．It uses examples from the child’s world. |
| B．The author introduces animals with poems. |
| C．It contains bright colors. |
| D．It takes a close look at sea animals. |
Who has won an award as an illustrator or a photographer?
| A．Nick Maland. | B．Tom Stack. |
| C．Jan Sovak. | D．Frank Greenaway. |
A child who wants to learn about how whales communicate will buy .
| A．Big Blue Whale | B．Life in the Coral Reef |
| C．North American Endangered Species | D．Whale |
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