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   Cellphones, tablets, and computers are keeping children and teenagers awake at night-even when they' re not in use, according to new research. A study published on Monday in JAMA Pediatrics says that media devices are causing kids to sleep less and reducing the quality of sleep that they get. This leads to trouble of staying awake the next day.

Researchers analyzed hundreds of studies of children and teens aged 6-19. The scientists found a strong and consistent association between the use of technology at bedtime and poor sleeping. The reason is not just that kids are staying up too late with their devices. Using a computer can overstimulate the mind and emotions, the researchers say. A smartphone or tablet also gives off a light that affects the body's natural timing. These factors contribute to poor quality sleep. And many kids could be at risk. According to the study,72% of all children and 89% of adolescents have at least one device in their sleep environment. Most of these devices are used near bedtime.

"The harmful association between screen-based devices and kids' sleep is a major public health concern," the study concludes. In their conclusion, the researchers urge parents to understand the damaging influence of device use before sleep.

【小题1】What do the researchers disagree with?
A．Children even in dreams can be influenced by media devices.
B．Most adolescents like to play media devices before sleep.
C．Using media devices on bed makes kids sleep difficultly.
D．Using media devices can not excite the mind and emotions.
【小题2】How does a smartphone affect a child's sleep?
A．By making noises.
B．By giving off a light.
C．By attracting a kid's attention.
D．By sending out electronic waves.
【小题3】What can we learn from the second paragraph?
A．Media devices anytime put kids in danger.
B．Adolescents are more easily affected than children by phones.
C．Using technology at bedtime causes poor sleeping.
D．Media devices affect kid's performance at school.
【小题4】Whom does this article most probably writes to？
A．Scientists.B．Parents.
C．Children.D．Producers.
上一题 下一题 0.99难度 阅读理解 更新时间:2019-07-26 09:57:05

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同类题1

Satellites(卫星) are an important part of our ordinary lives．For example, the information for weather forecasts is sent by satellite．Some satellites have cameras which take photographs of the Earth to show how clouds are moving．Satellites are also used to connect our international phone calls．
Computer connections of the World Wide Web and Internet also use satellites. Many of our TV programs come to us through satellites．Airplane pilots also sometimes use a satellite to help them find their exact location．
We use satellites to send television pictures from one part of the world to another．They are usually 35，880 kilometers above the equator（赤道）．Sometimes we can see a satellite in the sky and it seems to stay in the same place．This is because it is moving around the world at 11，000 kilometers an hour—exactly the same speed that the earth rotates．A satellite must orbit the Earth with its antennae(天线)facing the earth．Sometimes, it moves away from its orbit（轨道），So there are little rockets on it which are used to put the satellite back in the right position．This usually happens about every five or six days．
Space is not empty! Every week, more and more satellites are sent into space to orbit the Earth．A satellite usually works for about 10-12 years．Satellites which are broken are sometimes repaired by astronauts or sometimes brought back to Earth to be repaired．Often，very old or broken satellites are left in space to orbit the Earth for a very long time．This is very serious because some satellites use nuclear power and they can crash（撞）into each other．
【小题1】Which of the following is NOT done by satellites according to the passage?
A．Sending information for weather forecast．
B．Taking photographs of the Earth．
C．Sending TV pictures．
D．Providing food for airplane pilots．
【小题2】What’s the speed the earth rotates at?
A．35,880 kilometers per hour．
B．335,880 kilometers per hour．
C．11,000 kilometers per hour．
D．110,000 kilometers per hour
【小题3】Why does the satellite move around the world at the same speed as the Earth rotates?
A．In order to take photographs．
B．In order to stay in a certain position in the orbit．
C．In order to move away from its orbit．
D．In order to send television pictures．
【小题4】What does the underlined word “This” in the 3rd paragraph refer to?
A．A satellite．
B．A little rocket．
C．A satellite seems to stay in the same place in the sky．
D．The satellite puts the rockets in the right position．

同类题2

Amazing Benefits of Listening to Music

If you love listening to music, you’re good company. 【小题1】

★Music makes you happier.

When you listen to music, your brain produces a special matter. It biologically (生物学上) causes listeners to feel emotions like happiness, excitement, and joy. So next time you need an emotional increase, listen to your favorite tunes for 15 minutes.

★【小题2】

Listening to music you enjoy reduces levels of the stress in your body. This is an important finding since stress causes many illnesses. To stay calm and healthy during a stressful day, turn on the radio.

★Music helps you sleep better.

A study showed that students listening to classical music for 45 minutes slept better than students who did nothing. If you’re having trouble sleeping, try listening to a little Bach or Mozart before bedtime.

★Music helps you eat less.

【小题3】If you’re looking for ways to reduce your appetite (食欲), try dimming the lights and listening to soft music next time you sit down for a meal.

★Music strengthens learning and memory.

Researchers discovered that music can help you learn and recall information better. 【小题4】 Memorize these results. You now have a strategy to study more effectively for your next test.

★Music raises IQ and school performance.

Research shows that taking music lessons predicts higher school performance and IQ in young children. 【小题5】

A．Music lowers stress and improves health.
B．Participants who were musicians learned better with light music.
C．Musical training can help raise our IQs and even keep us sharp in old age.
D．Here are amazing scientifically proven benefits of being attracted by music.
E．Recent research shows that listening to music improves our happiness.
F．Softening the lighting and music can lead people to eat fewer calories and enjoy their meals better.
G．To help your children achieve excellence in their studies, encourage them to sing or learn to play an instrument.

同类题3

   What’s your opinion on spicy food? Some people cannot handle even the smallest amount of chili peppers in their dinner while others can’t get enough of them.

Scientists have long been puzzled by why some people love the chili while others loathe it. Plenty of research has been done on the subject, dating as far back as the 1970s. Previous results showed that a love of chilies is related to childhood experiences, and that cultural influences affect our taste too. But the latest study has found that a person’s love of spicy food may be linked to his or her personality (性格) more than anything else, CBC News reported.

“We have always assumed that liking drives intake — we eat what we like and we like what we eat. But no one has actually directly bothered to connect personality with intake of chili peppers,” said Professor John E. Hayes from Pennsylvania State University, who led the study.

But before you look at the study, you should first know that “spicy” is not a taste, unlike sour, sweet, bitter and salty taste. It is, in fact, a burning feeling that you feel on the surface of your tongue. This got scientists thinking that maybe a love of spicy food is brought about by people’s longing for thrill, something they usually get from watching action movies or riding a roller coaster.

In the study, 97 participants, both male and female, were asked to fill out questionnaires about their personality, for example, whether they like new experiences or tend to avoid risks. They were then given a glass of water with capsaicin (辣椒素), the plant chemical that makes a chili burn, mixed into it.

By comparing the answers to the questionnaire and what participants said they felt about the spicy water, researchers found that those who tended to enjoy action movies or take risks were about six times more likely to enjoy the spicy water.

Interestingly, we used to believe that the reason why some people can withstand (耐受) spicy food is that their tongues have become less sensitive to it. However, this latest study has found otherwise. “It’s not that it doesn’t burn as badly, but that you actually learn to like the burning feeling,” Hayes explained.

【小题1】What’s the meaning of the underlined word “loathe” in the second paragraph?
A．Dislike.B．Fear.
C．Put up with.D．Adapt to.
【小题2】What did Professor John
A．Hayes and his team discover from their study?
B．What we eat actually helps to develop our personality.
C．Males are more likely to enjoy spicy food than females.
D．Those trying to avoid risks tend to be less interested in spicy food.
E．People are wrong to treat " spicy" as a kind of taste rather than a feeling.
【小题3】Why do some people like spicy food according to the recent study?
A．Because their taste has become less sensitive.
B．Because they love the burning feeling.
C．Because they want to challenge themselves.
D．Because the more they try spicy food, the less it burns.
【小题4】What’s the main idea of the passage?
A．What one likes to eat mainly depends on one’s personality.
B．Whether one enjoys spicy food depends largely on one’s personality.
C．One’s personal experiences have nothing to do with their taste.
D．Different people have different taste.

同类题4

Are some people born clever, and others born stupid? Or is intelligence developed by our environment and our experience? Strangely enough, the answer to these questions is yes. To some extent our intelligence is given to us at birth, and no amount of education can make a genius out of a child born with low intelligence. On the other hand, a child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied surroundings. While the limits of a person’s intelligence are fixed at birth, whether or not he reaches those limits will depend on his environment. This view, now held by most experts, can be supported in a number of ways.
It is easy to show that intelligence is to some extent something we are born with. The closer the blood relationship between two people, the closer they are likely to be in intelligence. Thus if we take two unrelated people at random(随机地) from population, it is likely that their degrees of intelligence will be completely different. If, on the other hand, we take two identical twins, they will very likely be as intelligent as each other. Relations like brothers and sisters, parents and children, usually have similar intelligence, and this clearly suggests that intelligence depends on birth.
Imagine now that we take two identical twins and put them in different environments. We might send one, for example, to a university and the other to a factory where the work is boring. We would soon find differences in intelligence developing, and this indicates that environment as well as birth plays a part. This conclusion is also suggested by the fact that people who live in close contact with each other, but who are not related at all are likely to have similar degrees of intelligence.
【小题1】Which best describes the writer’s point in Para.1?
A．Intelligence is given at birth.
B．Intelligence is developed by the environment.
C．Intelligence is fixed at birth, but is developed by the environment.
D．Some people are born clever and others born stupid.
【小题2】It is suggested in this passage that __________.
A．close relations usually have similar intelligence
B．unrelated people are not likely to have similar intelligence
C．the closer the blood relationship between people, the more different they are likely to be in intelligence
D．people who live in close contact with each other are not likely to have similar degrees of intelligence
【小题3】The example of the twins going to a university and to a factory separately shows_________.
A．the importance of their intelligence
B．the effect of environment on intelligence
C．the importance of their positions
D．the part that birth plays
【小题4】The best title for this article would be “_____________”.
A．On Intelligence
B．What Intelligence Means
C．Born with Intelligence
D．Environment Decides Intelligence

同类题5

语法填空
Even after centuries of 【小题1】(science) research, no one knows for sure why human beings laugh.
Charles Darwin guessed that laughter, 【小题2】 begins in infants as young as three months old, served as a"reward"to parental care-giving. Laughter of infants sounded and felt so different from crying, and he believed that even prehistoric(史前的) parents must have regarded it 【小题3】 a sign of well-being. The parents enjoyed the laughter, which encouraged them 【小题4】(continue) caring for the child.
One of the most interesting things researchers have learned is the powerful healing effect of laughter. Well,actually they're re-learning it after centuries of neglect:in the Middle Ages, doctors "treated" their 【小题5】(patient) by telling them jokes.
Scientists 【小题6】(learn) a lot about laughter so far.You use 15 different muscles in your face to laugh. The sound of laughter is created when you breathe in deeply 【小题7】 then breathe out the air. The typical laugh is made up of pulses(节奏)of sound that are about 1/15th of a second long and 1/5th of a second apart.When tape-recorded and 【小题8】(play) backward,laughing sounds 【小题9】(virtual) the same as it does when it is played forward. 【小题10】 was also found that the most laughter took place when males were talking and females were listening, and the least took place when females were talking and males were listening.
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