Sleep experts say human's natural body clock begins to rest and relax from the day between 9 and 10 pm but the use of computers confuses it.
A person's brain biologically becomes awake when the sun is out because bright light after dark causes the brain to stop producing the hormone (荷尔蒙) called melatonin that makes us sleepy.
Researchers say blue light from devices such as iPads, which is expected to become a popular reading tool when it comes out later this month, is particularly disruptive (干扰的)during the night when the brain thinks it should be dark.
Experts say a good book is a far better way of resting the brain and ensuring a good night's sleep because the bedside lamp(灯) light doesn't affect the brain as it does not look straight into a person's eyes.
“Potentially, yes, if you're using an iPad or a laptop close to bedtime... that light can be stimulating (刺激) to the brain to make it more awake and delay your ability to sleep,” Phyllis Zee, a professor at Northwestern University and director of the school's Centre for Sleep & Circadian Biology, told CNN.
“And I think more importantly, it could also be enough to affect your circadian (昼夜节律的) rhythm. This is the clock in your brain that determines when you sleep and when you wake up. ”
Alon Avidan, associate director of the Sleep Disorders Center at the University of California Los Angeles, added, “I wish people would just take a boring book — an oldfashioned book — and read by a lamp.”
【小题1】The underlined word “insomnia” in the first paragraph probably means “________”.
A.being unable to eat properly |
B.brain injury |
C.being unable to fall sleep |
D.lack of energy |
A.makes us sleepy |
B.helps us relaxed |
C.prevents us from waking up |
D.makes us excited |
A.it doesn't give out blue light |
B.it's not as bright as your laptop |
C.it doesn't enter your eyes directly |
D.it is adjustable |
A.one who uses his laptop often before bedtime can have his body clock disturbed |
B.using a laptop before bedtime is more harmful than using an iPad |
C.we'd better not do anything before going to bed |
D.the best time to go to bed is before 9 pm |
The wandering Earth Ⅱ, a science-fiction movie, has aroused hot debate among galaxy scientists and science-fiction writers, both in China and overseas. Among them, John Gribbin, a UK-based science writer, speaks highly of rising science education in China and says that’s what makes science fiction prosper.
“It is very important in this technological age for people to understand the fundamentals of science, and then popular science writing can inform them of the world around them,” he says. “This is a bit like music. Even if you are not a great musician, if you know a little bit, you gain a deeper appreciation of great music.” Zhou Binghong, a researcher at the China Academy of Space Technology, holds a similar view. “The more scientific knowledge one gains, the more questions he or she will have about how the world runs. This leaves them wanting to know more, especially youngsters.”
Both episodes of The Wandering Earth include quite a few imagined technologies that need basic scientific knowledge to understand. In the latest one, for example, what aroused most fierce discussions among the public is a “space elevator” that enables astronauts to complete their trips to space by taking an elevator instead of a rocket. On various platforms, there are discussions about whether such an elevator is possible. If it is, what materials would be used?
For Zhou, such discussions themselves mean the public has a taste for science. He says, “Interest marks the first step toward creativity. Who knows who will emerge as an engineer for such an elevator in 50 years’ time?”
Impressed by the progress of science-related industries in China, Gribbin says that, “It is going from strength to strength,” and that, “China is one of the leading countries for scientific research and technological development, and the Chinese people are naturally interested in these developments.”
【小题1】What leads to the popularity of science fiction according to Paragraph 1?A.The charm of science. | B.The attraction of literature. |
C.The popularity of the film. | D.The development of science education. |
A.To stress music is necessary in science. |
B.To tell why music appreciation is important. |
C.To show the relationship between music and science. |
D.To indicate the importance of learning scientific knowledge. |
A.It helps control the rocket. | B.It sends astronauts into space. |
C.It enables astronauts to walk in space. | D.It maintains astronauts’ safety in space. |
A.Putting Science into Fiction | B.Fictions Gaining Popularity |
C.Science Planting Seeds of Hope | D.A Leading Country for Scientific Research |
What is a database? A database is a collection of data or information that is organized, stored, and accessed electronically.
It is relevant. When searching for information in the database, you should be able to customize your search to get results relevant to you. There are several ways to search through a database, for example, using discipline-specific terminology, keywords, subject headings, etc.
It is accessible. First of all, access to the library is cither free or purchased by patrons so that you can access the information within it at no price.
A.It is reliable. |
B.It is reasonable. |
C.You may have to pay a small subscription fee as an independent researcher. |
D.Google Scholar isn't a database using these aspects as a determining criterion. |
E.It is organized so that searching and finding this information is easy and rapid. |
F.They are all relevant factors to be referred to when searching educational databases. |
G.You can set limitations such as the source type and the date or search by author or title. |
With all the talk about smart technology and connected homes, you may be wondering why you should take notice.
Efficiency
Smart technology allows you to connect your home’s electronic devices (设备) to one device, such as a phone, tablet or computer. Having a connected home means you have the ability to adjust your thermostat (恒温器), open and close window shades and make your security system start working from a distance.
Convenience
If fixing and operating smart technology equipment sounds difficult and expensive, it’s not. According to the ALA, there are simple and surprisingly inexpensive choices available on today’s market.
Retrofitting (改造)
Erik Anderson is the national sales manager for Lutron Electronics.
“All you have to do is take your existing dimmer (调光器) out of the wall and replace it with a Caseta dimmer, add a smart bridge, and you have the ability to control it from an app or from voice control with Alexa, Google Assistant or Siri,” says Anderson.
For added ease, Lutron’s Caseta Wireless system can combine with Apple, Amazon or Google platforms for use inside your home. And when you are outside, an app or geofencing (虚拟地理围栏) allows you to adjust your inside and/or outside lights, even before you arrive home.
A.Many people want to have a smarter home like this. |
B.That will make your home welcoming to you and your guests. |
C.Your security system starts working before you arrive home after dark. |
D.You can also program those devices to operate when you are not there. |
E.After all, it is not that difficult or inconvenient to turn your lights on and off. |
F.He explains that the Caseta Wireless system is very retrofittable into existing homes. |
G.Home apps can easily change your room into the perfect setting for different activities. |
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