Ever notice your phone dies faster in cold weather? But why? As LiveScience reports, it all comes down to chemical reactions within the battery.
If you were to open any smartphone, you'd probably find a Li-ion(锂离子)battery running the show. Inside the battery, there are two poles, a positive pole(正极)and a negative pole(负极), and how much charge your phone has all depends on which side the ions stay. A fully charged battery will be jam-packed with ions on the positive end, while a dead battery will have all the ions stored in the negative end.
Your phone is powered as the individual ions travel in solution(溶液)from one pole to the other, but a cold temperature doesn't cause the Solution flow in the battery itself. If it flowed, the ions would have to go somewhere, but they actually stay put when it gets cold. The cold temperature causes chemical reactions that slow down the current(电流). The only other time this smaller current is sent through the battery is when all the ions have been spent, so your phone mistakenly reads the slowdown as being out of power.
Now, how can you get yourself out of this situation? Dr. Stephen J. Harris, a chemist at the Lawrence Berkeley Lab, says whatever you do, don't charge it. Your fully charged battery isn't lacking ions, and the cold temperature isn't allowing more ions to be pulled into the anode. They pass through the solution as solid lithium, which can really do some serious damage to the battery cell itself.
The only way to get the battery back to life is to let it return to its normal operating temperature. We recommend leaving it in your pocket or spending a few minutes inside away from the bitter cold.
1.What do we know about the battery?·
A.We can just charge one side of it.
B.A dead battery stores no ions inside.
C.It's full with all ions on the negative end.
D.Smartphones are powered by Li-ion batteries.
2.What makes the phone dead in the cold weather?
A.The lack of ions. B.The loss of solution.
C.The slowdown of the current. D.The disorder of the ions.
3.What might Dr. Stephen agree to do when your phone dies in the cold?
A.Leave it in the cold. B.Warm it in the pocket.
C.Get it charged immediately. D.Restart it immediately.
4.What may be the best title of the text?
A.Reactions Inside the Battery B.Ways to Keep Phones Alive
C.Cold Weather Kills Your Phone D.How Phones Work Under Cold Weather
Fairies today are the material of, children's stories, little magical people with wings, often shining with light. Typically pretty and female, like Tinkerbell in Peter Pan, they usually use their magic to do small things and are mostly friendly to humans.
One explanation suggests the origin of fairies is a memory of real people. So, for example when tribes with metal weapons invaded land where people only used stone weapons some of the people escaped and hid in forests and caves. Further support for this idea is that fairies were thought to be afraid of iron and could not touch it. Living outside of society, the hiding people probably stole food and attacked villages. This might explain why fairies were often described as playing tricks on humans. Hundreds of years ago, people actually believed that fairies stole new babies and replaced them with a "changeling"-a fairy baby-or that they took new mothers and made them feed fairy babies with their milk.
While most people no longer believe in fairies, only a hundred years ago some people were very willing to think they might exist. In 1917, 16-year-old Elsie Wright took two photos of her cousin, nine-year-old Frances Griffiths, sitting with fairies. Some photography experts thought they were not real, while others weren't sure. But Arthur Conan Doyle, the writer of the Sherlock Holmes detective stories, believed they were real. He published the original pictures, and three more that the girls took for him, in a magazine called The Strand, in 1920. The girls only admitted the photos were not real years later in 1983, and that they created them using pictures of dancers that Elsie copied from a book.
1.What does the underlined words "this idea" in Paragraph 2 refer to?
A.Fairies used stone tools. B.Fairies used metal weapons.
C.Fairies are based on real people. D.Fairies are friendly to humans.
2.Why were fairies often described as playing tricks on humans?
A.Fairies were afraid of iron and could not touch it.
B.Fairies stole new babies and replaced them with a fairy baby.
C.People who were defeated would escape and hide in the forests.
D.The hiding people would probably steal food and attack villages.
3.Who thought the photos taken in 1917 were real?
A.Arthur Conan Doyle. B.Elsie Wright.
C.Most photography experts. D.Elsie Wright's cousin.
4.Which idea will the author most probably agree with?
A.Whether fairies exist or not is uncertain.
B.There are still many people believing in fairies.
C.Children should not believe in fairies any longer.
D.The attitude people hold towards fairies has changed.
Join the ranks of bright travelers and load up your smart phone with these must-have travel apps.
Sky Scanner
Stop wasting precious time clicking through website after website for airfare deals. Searching over 1,000 airlines and travel agents, Sky Scanner locates the cheapest dates to fly as well as the most affordable destinations. Got your heart set on some place special? Just enter your destination, dates, and the number of travelers and the app does all the heavy lifting for you.
Easy Travel
Just enter your city, or postal code into the search window, and Easy Travel will display the cheapest gas being served up near you. Whether you're driving in Canada, or the United States, Easy Travel is by your side helping you save money.
Bother Free
Don't be lost in translation. Here's an app that will serve as your travel translator, translating over 60 languages for your communication pleasure. It's easy! Just select the language you want to learn, speak or type a phrase into your phone, and the app will deliver a translation that you can read and hear.
World Atlas
You can have the whole world in your hands! National Geographic's beautiful award-winning World Atlas app is a must-have for armchair travelers and globetrotters alike. Spin, expand, and zoom the 3D globe to access detailed maps, tools to measure distances and need-to-know facts such as current weather, demographics and currency.
1.If one prefers self-driving tour, which app may help him or her save money?
A.Sky Scanner. B.Easy Travel.
C.Bother Free. D.World Atlas.
2.Who might be interested in Bother Free?
A.People with language difficulty. B.People who enjoy travel by plane.
C.People who want to travel cheaply. D.People with poor sense of direction.
3.In which part of a magazine can you most probably find this text?
A.Sports. B.Geography.
C.Travel. D.Traffic.
Directions: Write an English composition in 100-120 words according to the instructions given below in Chinese.
常言道：“良言一句三冬暖，恶语伤人六月寒”。一句鼓励的话能给人带来温暖，一句伤人的话会使人情绪低落。请你结合某一次经历，讲述自己的故事和感受。
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Directions: Translate the following sentence English, using the words given in the brackets.
1.父亲参与家庭教育对孩子的成长有积极的影响。(involve)
2.这款应用程序操作便捷，不妨下载一个在手机里。(better)
3.我的祖父人老心不老，他很幽默，常常会逗乐年轻人。(remain)
4.虽然过春节时城市里不准燃放烟花，但人们仍觉得少不了要热闹庆祝一番。(it)
Directions: Read the following passage. Fill in each blank with a proper sentence given in the box. Each sentence can be used only once. Note that there are two more sentences than you need.
Are You Treated Too Nicely?
A new study found that when trying to build high self-esteem in children, parents may unconsciously be creating little narcissists (自恋狂). 1.
Parents who are always praising their children may be trying to develop high self-esteem. 2. In fact, too much special treatment can lead to narcissistic behavior.
"3. That may not be good for them or for society." Brad Bushman, co-author of the study and professor of communication and psychology at the Ohio State University, said in a press release. "People with high self-esteem think they're as good as others, whereas narcissists think they're better than others."
This study, as well as previous studies about parent-child relationships Bushman has worked on, caused him to alter his own parenting style. When he began his research, he thought that children should be treated like they are special by their parents. 4. He said that interventions (干预) can help parents learn how to better support their children.
"Parent training interventions can, for example, teach parents to express affection and appreciation toward children without telling children that they are superior to others," Bushman said. "Future studies should test whether this can work."
A. Now he is careful not to follow that model.
B. Children whose parents tell them they are special are more likely to become narcissists.
C. But actually, they have realized that they are running their children.
D. Children believe it when their parents tell them that they are more special than others.
E. And he carefully carries out the principle.
F. However, the study showed that loving and emotionally warm parents are more likely to have confident kids.
