A cellphone is one of the few things that we hold close to our faces all the time, and yet it could possibly explode - this is what made the recent Samsung’s Galaxy Note 7 smart-phone accidents so shocking.
According to technology news website The Verge, flawed（有瑕疵的）phone batteries might be to blame.
Even if you are not a science student, you probably know that it is common sense that the anode (the negative（负的）end of the battery) and the cathode (the positive end) should never touch. If they do, the battery will short-circuit（短路）, causing a powerful electrical reaction that can destroy the battery and cause a fire.
This is why all lithium-ion（锂离子）batteries - the kind that can be found in many of our devices like tablets and cameras - have a separator layer inside to stop the two ends from touching one another.
But somehow, the separators in some of the Samsung phones broke, causing explosions.
Overcharging is another problem that can make batteries heat up quickly. Fortunately, most batteries are designed to be able to automatically stop charging once they are fully charged. But again, this somehow failed to happen in some of the Samsung phones.
The two “somehows” may sound random（随机的）and hard to explain. But they actually both come from the fact that phone producers have been pushing the limits of batteries to meet customers’ demand for a longer battery life.
According to Lynden Archer, a materials scientist at Cornell University, US, we have already achieved 90 percent of the battery life possible from a lithium-ion battery. Customers’ demand that their devices get thinner has also given producers little choice but to try to put more power into thinner batteries.
“The more energy you put into a box, the more dangerous it’s going to be,” Billy Wu, a lecturer at Imperial College London, told The Guardian.
A thinner battery also means producers have to use thinner material for separators, and thinner material has more chance of breaking.
1.A separator layer is put in lithium-ion batteries in order to ___________.
A. ensure a longer battery life
B. prevent a battery from short circuiting
C. connect the anode and the cathode
D. reduce a certain electrical reaction
2.What are the direct reasons for the Samsung phone explosions?
A. Short circuiting and overheating
B. Pushing the limits of batteries
C. Overcharging and thinner batteries
D. Automatic charging and broken separators
3.Lynden Archer’s comments indicate that ___________.
A. demands for thinner cellphones are unreasonable
B. lithium-ion batteries can’t hold much more power than that they do now
C. producers can use 10 percent of a lithium-ion battery
D. new material for batteries is needed to meet consumers’ demands
4.What is the writer’s main purpose of writing the article?
A. To describe problems facing cellphone producers
B. To explain the reasons for the Samsung phone explosions
C. To teach us common sense when it comes to batteries
D. To warn us about the dangers of lithium-ion batteries
At home, ordering food from a menu is a normal, everyday routine. I don’t even give it a second thought. In China, it’s a whole other story! Here, ordering is a fun game of trial and error, and the adventure begins before the food is even served!
Many restaurants in central Beijing advertise “English language menus”, but the translations can just add to the confusion. Although accompanying pictures can be a helpful relief, the translations often make the whole experience even more amusing. During my first few weeks in China I tried some delicious dishes with strange names. As an experiment, my friends and I would order things like “students addicted to chicken gristle (软骨)” and “red burned lion head”. It was always fun to see what landed on our table. Eventually we learned that “lion head” was actually pork, and “students” are “addicted” to diced (切碎的) chicken with green pepper.
Recently, I came across a busy restaurant down a narrow side street in a Beijing hutong. It was lunchtime and the small room was packed with people sitting on small stools (凳子) eating noodles. I was hungry and cold, and the steaming bowls looked irresistible! I sat myself down and called out for a “caidan!” In response, the waitress pointed to a wall at the back of the restaurant. The wall was full of Chinese characters describing numerous dishes. There was only one sentence in English: “crossing over the bridge noodles”.
I had never heard of the dish and had no idea what it would taste like. I took a gamble and ordered one bowl of “crossing over the bridge noodles”. A few minutes later the waitress carried over a heavy bowl full of broth (肉汤) and I quickly dug in. It was the best bowl of noodles I had ever tasted! I have been back again and again and each time I point at the one English sentence – “crossing over the bridge noodles”. I always enter a restaurant in China feeling excited and a little nervous. Who knows what the next ordering adventure will reveal?
1.How does the writer find the English-language menus in many of Beijing’s restaurants?
A. Confusing but amusing. B. Easy to understand.
C. Boring and annoying. D. Accurate and helpful.
2.The underlined word “gamble” in the last paragraph probably means ______.
A. taste B. look
C. step D. risk
3.The passage mainly deals with ______.
A. the author’s favorite Chinese dishes
B. the fun the author had ordering food in China’s restaurant
C. a comparison between Western food and Chinese food
D. the correct way to translate the names of Chinese dishes into English
4.The passage is developed mainly in the form of _____________.
A. examples and statements B. comparison and conclusion
C. causes and effects D. time and description
Raised in a fatherless home, my father was extremely tightfisted towards us children. His attitude didn’t soften as I grew into adulthood and went to college. I had to ride the bus whenever I came home. Though the bus stopped about two miles from home, Dad never met me, even in severe weather. If I grumbled, he’d say in his loudest father-voice, “That’s what your legs are for!” The walk didn’t bother me as much as the fear of walking alone along the highway and country roads. I also felt less than valued that my father didn’t seem concerned about my safety. But that feeling was canceled one spring evening.
It had been a particularly difficult week at college after long hours in labs. I longed for home. When the bus reached the stop, I stepped off and dragged my suitcase to begin the long journey home.
A row of hedge（树篱）edged the driveway that climbed the hill to our house. Once I had turned off the highway to start the last lap of my journey, I always had a sense of relief to see the hedge because it meant that I was almost home. On that particular evening, the hedge had just come into view when I saw something gray moving along the top of the hedge, moving toward the house. Upon closer observation, I realized it was the top of my father’s head. Then I knew, each time I’d come home, he had stood behind the hedge, watching, until he knew I had arrived safely. I swallowed hard against the tears. He did care, after all.
On later visits, that spot of gray became my watchtower. I could hardly wait until I was close enough to watch for its secret movement above the greenery. Upon reaching home, I would find my father sitting innocently in his chair. “So! My son, it’s you!” he’d say, his face lengthening into pretended surprise.
I replied, “Yes, Dad, it’s me. I’m home.”
1.What does the underlined word “grumbled” in Paragraph 1 probably mean?
A. Accepted happily. B. Spoke unhappily.
C. Agreed willingly. D. Explained clearly.
2.What made the author feel upset was ______.
A. the feeling of being less than valued
B. the fear of seeing something moving
C. the tiredness after long hours in labs
D. the loneliness of riding the bus home
3.The author’s father watched behind the hedge because ______.
A. he didn’t want to meet his son at the doorway
B. he wanted to help his son build up courage
C. he was concerned about his son’s safety
D. he didn’t think his son was old enough to walk alone
4.Which of the following can be the best title for the text?
A. My College Life. B. My Father’s Secret.
C. Terrible Journey Home. D. Riding Bus Alone.
| Monday | |
8 —10 a. m. | TECHNOLOGY Information Technology (IT)—Using the Internet In this lesson, students learn how to surf the internet safely and effectively. There will also be information about using different search engines. |
|
10:00 a. m. | DRAMA Students learn the play that the teacher gave before class. During this lesson, students will have the chance to act out roles with other students. | |
11:00 a. m. | PAINTING WITH WATERCOLOURS For most of this term, students learn how to use watercolours properly to make pictures. If the weather is good, the lesson may take place outdoors. | |
2 — 4 p. m. | SPORTS Students learn about the skills in a certain sport by watching video to see real action from past games. And then, students will play a short match lasting 45 minutes. This week, the sports are football (for boys) and tennis (for girls). | |
| HOMEWORK IT—the teacher will give students websites to look up at home. (about 20 minutes) Drama –students have to learn a part for the next lesson (about 40 minutes). | |
1.At _______, students are having a painting lesson.
A. 11:35 a. m. B. 4:30 p. m.
C. 10:30 a. m. D. 2:15 p. m.
2.Students should prepare a new part of _______ ahead of time as their homework.
A. Technology B. Painting
C. Sports D. Drama
3.The information in the table is mainly for students to _______.
A. choose teachers B. do their homework
C. take classes D. organize hobby groups
一个英文网站面向中学生征稿，请你写一篇英语稿件，介绍“中秋节”及这个节日里的主要活动。
写作要点:1.它是中国的传统节日之一，家人团聚。
2. 赏月、吃月饼 3. 还有旅游、访友等其他活动。
注意： 1. 词数100左右 2. 可适当增加细节，以使行文连贯 3. 开头已给出，不计入总词数。
参考词汇：中秋节the Mid-Autumn Festival 农历lunar calendar赏月enjoy the full moon 月饼 moon cake
The Mid-Autumn Festival
The Mid-Autumn Festival falls on the 15th of the eighth month of our Chinese lunar calendar
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此题要求改正所给短文中的错误。短文中有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（^），并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1. 每处错误及其修改均仅限一词。
2. 只允许修改10处，多者（从第11处起），不计分.
When I was a child, I hoped to live in the city. I think I would be happy there. Now I am living in a city , but I miss my home in countryside. There the air is clean or the mountains are green. Unfortunately, on the development of industrialization, the environment has been polluted. Lots of studies have been shown that global warming has already become a very seriously problem. The airs we breathe in is getting dirtier and dirtier. Much rare animals are dying out . We must found ways to protect your environment. If we fail to do so , we’ll live to regret it .
