In today's world, sleep experts say that for a better night's rest, Americans should turn off their smartphones or iPads before sleeping. Such electronic products make the brain more active, and then influence people's sleep. But according to a latest survey, more than 90% of Americans usually use a computer or some other kinds of electronic products in the hour before bed.
Researchers found that man-made light from some electronic products at night might reduce the levels of the brain chemicals that help sleep. The researchers showed that sitting in the light from tablets clearly reduced the levels of the chemicals which manage our body clocks and play a great role in the sleep cycle.
In the study, the researchers let volunteers read, play games and watch movies on a tablet for different time while measuring how much light their eyes received. They found that sitting for two hours before a bright tablet at night reduced the levels of the chemicals by about 22%.
Studies of students using computers at night have got the similar results. And researchers said that might not only cause sleeplessness, but also increase the risk of obesity(肥胖症), diabetes(糖尿病) and other diseases.
To be on the safe side, the researchers advise us to use computers less before bed, or turn down our screens low.
1. What can we learn from the first paragraph?A.Americans don't get enough sleep. | B.Electronic products are very popular. |
C.The brain becomes more active at night. | D.Sleep experts never use smartphones. |
A.By making our brains more tired. | B.By making our bodies weak. |
C.By reducing the levels of the brain chemicals that help us sleep. | D.By changing our body clocks. |
A.Making a survey about sleep. | B.Using smartphones in the daytime. |
C.Sitting in a bright room. | D.Surfing the Internet at night. |
A.Learn to use smartphones or iPads. | B.Watch some relaxing TV programs. |
C.Turn down the screens low. | D.Try to sleep earlier than before. |
相似题推荐
【推荐1】
You are always told to wash your hands before you eat. You know you must wash your hands after going to the bathroom. You should wash your hands many times during the day. Do you know how to wash your hands correctly?
Always use soap to wash your hands. After turning on the tap (水龙头) and wetting your hands, you can rub (摩擦) your hands with soap. Soap may not kill all the germs (细菌), but it can wash away the oil on your skin. As the oil is washed away, the germs will leave your hands and go away.
You should wash your hands for 15-20 seconds. How do you know the length (长度) of 15-20 seconds? You can sing ABC Song. By the time you get to the last note, your hands will be clean!
Rub your hands together. You can use one hand to rub the back of the other hand and then exchange two hands. You also need to rub between your fingers. Don’t forget to rub under and around your fingernails.
Maybe your hands don’t look dirty, but there are germs on them. Germs are too small for you to see. They are on your hands all the time. Many illnesses are caused by germs, so you should often wash your hands.
1. Why does the writer mention ABC Song?A.Because it is the most popular song in the world. |
B.Because everyone can sing this song very well. |
C.Because washing hands is as easy as singing ABC Song. |
D.Because you can sing this song to know the length of washing hands. |
A.音符 | B.注释 | C.笔记 | D.便条 |
A.Using soap to wash your hands. |
B.Using a clean towel (毛巾) to dry your hands. |
C.Washing your hands for about 20 seconds. |
D.Rubbing under and around your fingernails. |
A.why you should often wash hands |
B.what the best soap people usually use is |
C.what kind of germs there are on your hands |
D.how many germs there are on your hands |
A.How to stay healthy. | B.How to protect your fingers. |
C.How to wash hands correctly. | D.How to keep away from germs. |
【推荐2】Colors can affect (影响) our feelings, so knowing something about the colors can help us find the right colors in our homes.
It’s easy to see red in Chinese rooms. It’s our favorite color. It means happiness and luck. But if your bedroom is also red, you may not sleep well. It is an active color and makes us want to do sports.
Orange is a good color for the rooms where people usually eat. People like eating together and talking to each other in an orange room.
If you are a student, ask your parents to color your study (书房) yellow. Yellow can make you think faster and more carefully. You may be more confident (自信的) about yourself.
You may know most of the walls in the hospitals are blue. Why? Because blue can make sick (生病的) people feel relaxed. They can have a good sleep and be better soon. So use it in your bedroom and you can have a nice sleep, too.
1. What color makes you want to do sports?A.Red. | B.Blue. | C.Orange. |
A.Because it makes them eat more. |
B.Because it makes them think faster. |
C.Because it makes them be better soon. |
A.Blue walls. | B.Hospitals. | C.Sick people. |
A.Colors and Study | B.Colors and Feelings | C.People’s Favorite Color |
![](https://img.xkw.com/dksih/QBM/2022/11/23/3115742307508224/3122083129401344/STEM/3008627a168048988cc1e9fe3f08137a.png?resizew=164)
Nearly 3 billion people or 37% of the world’s population have never used the Internet, according to the United Nations, although the Covid-19 pandemic drives people online.
The UN’s International Telecommunication Union (ITU) (联合国国际电信联盟) estimated (估计) that 96% of the 2.9 billion people who have never used the Internet live in developing countries.
Internet use is often unaffordable in poorer nations. Almost three quarters of people have never been online in the 46 least-developed countries. What’s worse, even among those Internet users many hundreds of millions might only go online infrequently (不流畅), using shared devices (设备) or facing connection (连接) speeds that discourage their Internet use.
The Union said the number of people who have gone online rose from 4.1 billion in 2019 to 4.9 billion in 2021, partially (部分) because of a “Covid connectivity boost” (互联互通增加). “ITU will work to make sure no one will be left behind,” said the ITU secretary general, Houlin Zhao. “Poverty, illiteracy (文盲), limited electricity offer and few digital skills continued to challenge the ‘digitally excluded’ (数码排斥者).” he added.
1. What’s the number of the people who never use the Internet?A.over 3 billion. | B.more than 37% of the world’s population. |
C.About 2.9 billion. | D.4.9 billion. |
A.不流畅的 | B.不可连接的 | C.无信号的 | D.负担不起的 |
A.0.8 billion. | B.2.9 billion. | C.4.1 billion. | D.4.9 billion. |
①They go online frequently. ②They have to use shared devices.
③They have to face connection speeds. ④They can’t read and write.
A.①② | B.②③ | C.③④ | D.①④ |
A.The world’s population is about 8 billion. |
B.The Covid-19 pandemic makes people online. |
C.All the people who have never used the Internet live in developing countries. |
D.The ITU’S object is to make everyone be Internet users. |
【推荐1】Can’t find any place on Earth for your next holiday? Lucky for you, Space tourism is no longer a thing of science fiction. A Californian company is going to offer you a chance to take a vacation in space by building a hotel in orbit (轨道).
The Orbital Assembly Corporation plans to build Voyager Station, a space hotel that includes rooms for tourists, in 2026, and open it in 2027. It will be able to carry up to 400 people.
The space hotel will be shaped like a large wheel, with 24 space pods (舱) around the outside of the 200-meter-wide structure. Each pod is 24 meters long and 12 meters wide. The pods will be used for restaurants, bars, gyms, rooms for tourists, laboratories for research and so on.
The company says that some pods will even be private homes that people can buy. “Finally, going to space will just be another choice for people’s vacation, just like going on a cruise, or going to Disney World,” said Tim Alatorre, senior architect (建筑师) of the space hotel. He said that the space hotel may even include a concert hall and a movie theater.
The company says that the space hotel will have gravity (重力) that is about one-sixth as strong as Earth’s. The low gravity means people can do things like jump higher, lift heavier things and enjoy sports such as basketball in a new way.
With the industry rapidly developing, space tourism for common people is around the corner, and it might come much faster than we think. Who knows what the future might be like?
1. What does the underlined word “It” in Paragraph 2 refer to?A.The space tourism. | B.The corporation. | C.The space hotel. | D.The large wheel. |
A.To introduce the company. | B.To describe the space hotel. |
C.To support the architect’s opinion. | D.To express the tourists’ feelings. |
A.5 kilograms. | B.10 kilograms. | C.100 kilograms. | D.360 kilograms. |
A.Going on a cruise. | B.Going to Disney World. |
C.Playing basketball. | D.Building a laboratory. |
A.possible | B.hopeless | C.dangerous | D.tiring |
【推荐2】They hang from trees. They float in rivers and oceans. They are piled up in landfills(垃圾填埋场). Our frequent use of plastic products has, for many years, been a leading cause of serious environmental problems in the world. Last month, China drew up new guidelines(指导方针) aiming to bring plastic pollution under control across the country in five years’ time.
According to the new guidelines, the ban(禁令) on the use of non-biodegradable(不可生物降解的) plastic bags will have been applied to cities including Beijing and Shanghai by the end of this year. Other sources of plastic garbage will have been banned in these cities by the end of 2022. And that rule will have extended nationwide by late 2025.
Fortunately, China will not start from zero. Late last year, the country announced a national standard for biodegradable plastic shopping bags. It is technologically prepared for their production. Some regions have gained valuable experience that others can learn from. For example, Jilin province is leading the way by providing eco-friendly(环保的) shopping bags in some local supermarkets.
Given the size of China’s consumer market, one main obstacle(障碍) is the large number of plastic items that are being used by restaurants and e-commerce(电子商务) platforms. It’s estimated that nearly 25 billion plastic bags were used for deliveries in 2018. Most of them were rarely reused.
However, most Chinese people welcomed the government’s effort to reduce the use of plastics. “Beijing is thinking about the problem seriously,” said Tang Damin, a member of Greenpeace East Asia in Beijing. He added that the policy could be far more effective(有效) by using incentives(激励) such as a deposit(押金) return program on plastic products.
1. What does the writer want to tell us?A.China has invented biodegradable plastic shopping bags. |
B.Plastic pollution becomes more and more serious in China. |
C.Greenpeace East Asia in Beijing worries about the plastic pollution. |
D.China has drawn up new guidelines to reduce plastic pollution in five years. |
A.the rules will have extended nationwide by late 2025 |
B.plastic garbage will have been banned in Shanghai by the end of 2020 |
C.plastic bags won’t be allowed to be used in Beijing by the end of 2022 |
D.a deposit return program on plastic products will be put into practicing in 2023 |
A.Most Chinese people aren’t used to using paper bags. |
B.It’s hard to make effective policy to solve the problem. |
C.Many supermarkets are still providing customers with plastic bags. |
D.Restaurants and e-commerce platforms need large number of plastic items. |
A.The new guidelines are not much useful. |
B.People should be encouraged to follow the policy. |
C.The new policy can help a lot to develop Greenpeace. |
D.Beijing is thinking about the plastic pollution seriously. |
A.people will order more take-out food |
B.plastic bags will be widely reused in the world |
C.biodegradable plastic shopping bags will become popular |
D.there will be more people using paper products in the future |
![](https://img.xkw.com/dksih/QBM/2024/2/21/3438043418730496/3443421531488256/STEM/d31f15f9f75044ff853e574a87411a54.png?resizew=130)
Mukbang is about the eating shows in front of the screen. In the shows, mukbangers eat food and sometimes talk to their fans.
Mukbang started in South Korea (韩国) in around 2010 and is becoming well-known in the whole world now. Why did mukbang first appear in this country? The reason is that eating by oneself is quite normal in South Korea. Watching mukbang can be a way to have someone to eat with when they are at home by themselves.
This is one of the reasons why many people around the world like watching mukbang. However, the way mukbangers eat food in some shows isn’t healthy. This can make people have bad habits and bring serious health problems. What’s worse, to have more fans and make more money, some mukbangers prepare a lot of food in front. But they throw away much food during the show or throw up (吐) food after the show to make watchers believe they eat up everything. In fact, it is not because they feel ill. These mukbangers waste (浪费) a lot of food.
We all know that food waste is a serious problem around the world, and stopping food waste has a special meaning for our country. So our country is doing a lot of things to solve the problem. What do you think our country can do for mukbang?
1. What is mukbang?A.An eating show. |
B.A talk show. |
C.A cooking show. |
D.A game show. |
A.To make their food delicious. |
B.To learn how to cook food. |
C.To have someone to eat with. |
D.To buy some healthy food. |
A.Mukbang is world-famous. |
B.Mukbang is not always good. |
C.Mukbang isn’t healthy. |
D.Mukbang makes people ill. |
A.All Mukbang bring serious problems. |
B.People will stop watching Mukbang. |
C.Mukbang will have more fans and money. |
D.Our country will make rules for Mukbang. |
A.![]() | B.![]() |
C.![]() | D.![]() |
Just when the student reached the lake, a cow was walking in the lake. So the water became very dirty. He thought “I can’t give the dirty water to my teacher!”
He came back and told the teacher, “The water is very dirty. We can’t drink it.” After about half an hour, the teacher asked the student to get some water again. So he went back to the lake.
But the lake was still dirty. So he told the teacher the same thing. After some time, the teacher asked him to go back again. But this time, he found the water was clear. The mud in the water came to the bottom. So he got some water.
The teacher looked at the water and said to him, “You did nothing to make the water clear. You just let it be… Your mind is also like that! When it is bothered, just let it be. Give it some time.”
1. One day the teacher asked his student to .
A.make the lake clear |
B.drive away the cow in the lake |
C.get some water to drink |
D.get some water to wash his face |
A.Twice. | B.Three times. |
C.Four times. | D.Five times. |
A.The cow | B.The elephant. |
C.The teacher. | D.The student |
A.drink some water | B.eat something |
C.do nothing | D.ask him for help |
A.the teacher taught his student something useful |
B.the teacher wanted his student to work hard |
C.the student know how to make the water clear |
D.the student was very lazy |
【推荐2】Early to bed and early to rise makes a man healthy, wealthy (富有的) and wise (明智的).
This is an old English saying. It means that we should go to bed early at night and get up early in the morning. If we do, we shall be healthy. We shall also be rich and clever.
Is this true? Perhaps it is. The body must have enough sleep. Children of your age need ten hours’ sleep every night. If you go to bed late, you can’t have enough sleep. Then you can’t think carefully and your homework will be wrong. You will not be wise and you may not become rich!
Some people go to bed late at night and get up late in the morning. This is not good for them.
We should sleep at night when it is dark. The dark helps us sleep well. When the daylight comes. we should get up. This is the time for exercise. If the body is not used, it will become weak. Exercise keeps it strong.
Exercise helps the blood (血液) to move around inside the body. Blood takes nutrition (营养) to all parts of our bodies. The brains (大脑) in our heads also need blood. We think with our brains. If we keep our bodies healthy, take exercise, and we can think better!
Our bodies also need air to work well. Without air we will die. Get up early in the morning and we can have plenty of clean, fresh air. That will keep us healthy and happy.
根据短文内容,判断句子正(T)误(F)。
1. The old English saying tells us how to make more money.
2. A child needs 10 hours’ sleep every night.
3. To make your body strong, you must get up early.
4. The more sleep you have, the cleverer you are.
5. If we keep our bodies healthy, take exercise, and we can think better.
The American alligator (短吻鳄) is the largest reptile (爬行动物) in North America. Some of them can be over 5 metres long.
![](https://img.xkw.com/dksih/QBM/2016/1/6/1578793760931840/1578793761251328/STEM/8e765e6610354f709be166234195f0c0.png)
In North America, the bison (野牛) is the largest animal on land. If they are frightened, the American bison will run away and can reach a speed of 52 km per hour.
![](https://img.xkw.com/dksih/QBM/2016/1/6/1578793760931840/1578793761251328/STEM/301577c6cbb547eaa8996fb6e1970a57.png)
The white-tailed deer can run up to 58 km per hour. This North American deer can also jump as high as 2.6 metres and jump as far as 9 metres.
![](https://img.xkw.com/dksih/QBM/2016/1/6/1578793760931840/1578793761251328/STEM/25397962c1fd40528c11098677e1bbb7.png)
There is a frog that barks just like a dog. This barking frog is found in the southwestern part of the United States.
![](https://img.xkw.com/dksih/QBM/2016/1/6/1578793760931840/1578793761251328/STEM/110142afb5424c6db47c500e7eb26567.png)
The polar bear is a great swimmer and can swim as fast as 10 km per hour using only its front feet.
![](https://img.xkw.com/dksih/QBM/2016/1/6/1578793760931840/1578793761251328/STEM/9aeb56f4d0704f6f8156f914fb82c392.png)
The wild turkey nearly died out in the early 1900’s, because people hunted many of them. This wild bird is making a comeback now.
![](https://img.xkw.com/dksih/QBM/2016/1/6/1578793760931840/1578793761251328/STEM/9b946128d2f0457e86d1a72aadf759a7.png)
1. The ________ is the largest animal on land in North America.
A.polar bear | B.bison |
C.alligator | D.white-tailed deer |
A.southwest | B.southeast |
C.northwest | D.northeast |
A.52 km | B.58 km | C.9 metres | D.10 km |
A.is good at running | B.is good at swimming |
C.swims with its back legs | D.can jump as far as 9 metres |
A.The alligator is the largest reptile in North America. |
B.The white-tailed deer can jump as high as 2.6 metres. |
C.Six kinds of animals are mentioned in the passage. |
D.The wild turkey died out about 1000 years ago. |
【推荐1】Women around the world are working to help the environment. Here are four who have done their part to protect Earth’s plants and animals. Which of these women most encourages you to take action?
Scientist Jane Goodall was born in London, England. She has always loved animals. She especially loves apes. Chimpanzees are apes. At age 26, Goodall began studying chimps in Tanzania. That’s in Africa. She is fighting to prevent trees being cut down in chimps’ living areas. |
Activist Wangari Maathai was known as the Mother of Trees. She taught people how important trees are to the environment. She started a group that plants trees across Africa. In 2004, she won the Nobel Peace Prize. Maathai died in September, 2011. |
American Sylvia Earle has always cared about the ocean. This scientist works to save the world’s oceans from pollution and overfishing. She goes on researching with her team. The trips help people be aware of ocean protection. |
Scientist and environmental activist Vandana Shiva was born in India. She works to protect farmland. She helps people grow healthier and safer foods. Shiva has written many books. They teach readers about the importance of the land and how to take care of it. |
1. Who pays much attention to animals in her study?
A.Jane Goodall. | B.Wangari Maathai. | C.Sylvia Earle. | D.Vandana Shiva. |
A.She once studied apes in Africa. | B.She sells healthier and safer food. |
C.She is both a writer and a scientist. | D.She has much knowledge of trees. |
A.Nobel Prize winners. | B.Scientists who protect oceans. |
C.Famous animal lovers. | D.Women who help the environment. |
There was an ancient Chinese story. A naughty boy Mencius and his family lived next to the cemetery(墓地) . Mencius liked to hold funerals(葬礼) just like people around. His mother took him and they moved to a market. Then Mencius and his neighbors’ children learned to buy and sell meat. Finally, they moved again and lived next to a school. In this neighborhood, people treated each other politely. The mother of Mencius thought that it was the right living place for her son.
The story tells us the importance of people around us. For students, they can be role models. In a study, I interviewed some students at Bingham High School. These teens had lots of opinions about role models.
Teens need role models to provide directions for them. Jeff Pratt said, “Having a role model helps you decide where you want to go with your life.” A role model shows what a teen’s life could be like in the future.“Role models are people you admire, and those people can help make you be a good person.” This is Spencer Park’s opinion of what role models are and why it is important to have them.
“A role model is someone to look up to and try to learn good qualities from,” said Natalie Bean. When teens were asked “What is a role model like?” , the list included words such as encouraging, inspiring, strong-willed, honest, ready to stand up for what they believe in, helpful, easy to talk to, talented and cheerful. Teens want to learn from their role models how to succeed and how to carry on after failure.
Robbie Jenkins said, “Good role models are people that stand up for what is right and good. Role models encourage and inspire others.” Heidi Woolley said, “A good role model makes a teen do the best in school and life, and make much progress. Then he will have a right opinion of his own abilities and accept himself gradually. In this way, role models help build up a teen’s self-esteem.”
“The role models teens need are not the ones that appear in the media.” said Natalie Bean.
My study also shows students agree with that a true role model is not the person with the best job title, the greatest responsibility, or the greatest fame(名望). Anyone who inspires a child to achieve dreams in life can be a good role model.
1. The writer uses the story in Paragraph 1 to show that_________.A.people should have good habits | B.people are easily influenced by others |
C.people are able to choose good neighbours | D.people know how to choose a living place |
A.Role models stand up for what is right and social. |
B.Anyone can inspire a child to achieve dreams in life. |
C.Having a role model decides where you want to go with your life. |
D.A teen can learn good qualities from a good role model. |
A.how to be a director | B.how to choose a right living place |
C.how to succeed and how to carry on after failure | D.how to do the best in school |
A.self-respect | B.self-control | C.self-praise | D.self-support |
A.To know what students’ role models do. | B.To tell how a teen learns from a role model. |
C.To find out students’ ways to be a role model. | D.To share ideas of some teens about role models. |
![](https://img.xkw.com/dksih/QBM/2014/12/18/1566760191557632/1566760195407872/STEM/d5163dc2b05e4d84bab03186fbfbe930.png)
根据短文内容,选择正确答案。
1. There are ________ people in the family.
A.three | B.four | C.five |
A.3 | B.2 | C.4 |
A.Raph | B.The teacher | C.Leo |
A.Mike | B.Leo | C.Don |
A.China | B.America | C.Japan |