You know that balloons must be kept away from sharp objects. They also needed to be kept away from flames. A fire can weaken the rubber and cause it to break. However, in this experiment you will find out how you can hold a balloon directly in a flame without breaking the balloon.
Materials needed:
● two round balloons not inflated(充气的)
● several matches
● water
Inflate one of the balloons and tie it. Place 1/4 cup of water in the other balloon, and then inflate it
and tie it. Light a match and hold it under the first balloon. Allow the flame to touch the balloon. What happens? The balloon breaks, perhaps even before the flame touches it. Light another match. Hold it directly under the water in the second balloon. Allow the flame to touch the balloon. What happens to this balloon? It doesn’t break.
Why does the balloon with no water break in the flame? The flame heats the rubber of both balloons. The rubber of the balloon without water becomes so hot that it becomes too weak to resist the pressure of the air inside the balloon. However, when the balloon with water in it is placed in the flame, the water takes in most of the heat from the flame. Then, the rubber of the balloon doesn’t become very hot, it doesn’t weaken, and the balloon doesn’t break.
Water is a particularly good absorber(吸收者) of heat. It takes a lot of heat to change the temperature of water. On the other hand, when water cools, it gives off a great deal of heat. That’s why areas near oceans or other large bodies of water don’t get as cold in winter as areas at the same latitude(纬度) further inland.
1. From the passage we can know the following aspects of the experiment except______.
A. method B. material
C. result D. time
2.What does the underlined word “resist” in Para 4 probably mean?
A. add B. expand
C. bear D. form
3. When the flame reaches the balloon with water inside, ______
A. the rubber of it doesn’t become hot at all
B. the water in it begins to boil
C. the balloon breaks
D. the heat is mostly taken in by the water
4. The purpose of the experiment described in the passage is to prove that______.
A. water is a particularly good absorber of heat
B. some balloons can be easily broken, while others can’t.
C. balloons without water are not as strong as those with water inside.
D. the temperature is not up to the latitude.
Bell Teacher Campus 2016: Cultural Talks
Our talks start at 16:00 on the first week in August, and each one lasts about one hour. Each talk will be offered only once during your 4-day stay. Please sign up on the main Bell Noticeboard (Second floor, Mary Allan Building).
August 1st
BRITISH MUSIC, by Pete Sharma in Room 106. British music is famous worldwide. In this talk, I’ll discuss what’s popular and what’s not right now and the top music festivals in the UK. We will listen to some of the artists and share some thoughts about singing and dancing.
August 2nd
LOVE ME, LOVE MY CAT, by Lis Harrison in Room 207. We will be looking at this national interest through idioms(习语), songs, and everyday British life, and along the way covering some vocabulary for “talking cat”. At the end, we’ll be discussing that old topic: do we Brits treat out pets better than we treat our kids?
August 3rd
A GAME AS ENGLISH AS CROQUET(槌球游戏)，by Anna Young in Room 218. First, we will look at the origins of croquet, a much loved garden game in England. We will look at simple croquet rules, and then practice time! We’ll go out and play!
August 4th
WHY ENGLISH PEOPLE LAUGH, by Jim Scrivener in Room 117. Let me try to show you a little bit of what British people find funny. You will discover some of the most popular radio& TV comedy game shows. You probably won’t find it funny at all! But you will learn a bit more about us Brits!
1. If you are interested in the best music festivals in the UK, you may find the talk on _____ valuable.
A. August 1st B. August 2nd
C. August 3rd D. August 4th
2.Who will give the talk on a popular game in England?
A. Pete Sharma B. Lis Harrison
C. Anna Young D. Jim Scrivener
3.The text is most probably written for those who ______.
A. plan to do business in Britain
B. take short-term training courses
C. are interested in new technologies
D. want to learn about the history of Britain
Last spring, I was fortunate to be chosen to join in an exchange study program. The moment I arrived in Paris, I was greeted by a nice French couple who would become my host parents. The bit of French I had taken in high school began coming out of my mouth; speaking the language would only become more natural over the course of the term. At the airport, we all got into the couple’s car and began the journey to their townhouse. We talked the whole way, getting to know one another.
Every day afterwards, I would eat breakfast with the two of them, and then we’d all go our separate ways for the day. In the evening, my host mother would make delicious dinners for the three of us. My experience was exciting until I received some shocking news from my program coordinator（协调人）: There had been a death in my host parents' family and they would have to go away for several weeks to deal with all the business that arises from the death. That afternoon, I had to move out of one family's house and into another.
The coordinator told me I'd have a roommate and asked whether I would mind sharing a bedroom with an English speaker. To avoid speaking my native language, I asked not to be placed with an English-speaking roommate. When I got to my new room, I introduced myself to my new roommate Paolo, a Brazilian（巴西人）, the same age as I, whom I was surprised to find playing one of my favorite CDs on his computer! In just a few hours, we knew we'd be good friends for the rest of the term.
I left France with many stories, so when people ask me what my favorite part of the trip was, they always hear about my Brazilian friend Paolo and the weekdays in class, weeknights on the town, and weekends exploring France we enjoyed together. I would recommend an exchange program to anyone who wants to experience foreign cultures and gain meaningful friendships.
1.What do we learn about the author?
A. He was good at French before arriving in Paris.
B. He studied in France for a term.
C. He got to his host family by taxi.
D. He worked very hard in France on weekends.
2.Why did the author move into another host family?
A. He wanted to make friends with different people.
B. The first family’s host mother was seriously ill.
C. The first family had to leave for some time.
D. He hoped to live with an English speaker.
3.What helped start the author’s friendship with Paolo?
A. Lessons B. Stories C. Music D. English
4.Why did the author write the text?
A. To show the importance of learning foreign cultures.
B. To discuss how to build meaningful friendships.
C. To explain how exchange study programs work.
D. To describe his experiences in an exchange program.
假定你校开展了“根除陋习，创建文明校园”的活动。请你以此为主题用英语写一篇发言稿，向全校学生倡议：
1.根除：乱扔垃圾、浪费食物、吸烟……
2.提倡：讲礼貌、互助……
注意：
1.词数100左右；
2.可以适当增加细节，以使行文连贯；
3.开关和结尾已为你写好，不入总词数。
Dear friends,
As is known to all, our school has launched a campaign against bad habits in order to build a civilized school. ____________________________________________
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假定英语课上老师要求同桌交换修改作文， 请你修改你同桌写的以下作文。文中共有十处语言错误， 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，在该词下面写出改正后的词。
注意： 每处错误及修改均仅限一次;只允许修改10处， 多者从第11处起不计分。
Dear Alice,
I was delighted to receive your letter. Thank you on the English dictionary you bought it for me. I received it this morning. There is no doubt which it is of great help to me. I’m deep grateful for your advice that I should pay more attentions to practicing my spoken English. I’ve made up my mind to speak English both in and out of class. Next month I’ll take trip to Australia, which is organizing by my school. I hope I can practiced my spoken English there as much as possible. By the way, I am sending you a set of stamps with this letter, but I’ll send you more if I got any. I do hope you will have a good holiday.
Yours,
Jack
Writing text messages while walking is dangerous. A study says it is more dangerous than texting while driving. Researchers found that there are more 1. (injury) to texting pedestrians(行人) than there are to texting motorists. Their report says walking is not as easy 2. we think. We must focus on many things at the same time to walk safely in a straight line. The researchers said that people forget how to walk 3.(proper), so dangerous things happen to them. They bump(撞) into walls and other people. They walk into cars, fall over things in the street, 4. even fall into holes.
A professor said walking is a difficult action. There are several reasons 5. texting makes walking dangerous. 6. is that people cannot see the street. Another is that they focus on their phone keyboard instead of their feet. A final reason is that their minds are somewhere else—they are not thinking about 7. (walk) from A to B safely. The professor said over 6,000 people 8. (visit) his hospital last year because of texting. He said 9. worst cases are head injuries. When a pedestrian is tossed into the air he/she has nothing 10. (protect) the head. The damage can be serious.
