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The surprising experiment I am about to describe proves that air is all around you and that it proves down upon you. Air pressure is a wonderful force. When you swim underwater, you can feel water push down your body. The air all around you does the same. However, your body is so used to it that you do not notice this. The pressure is caused by a layer of air called the atmosphere. This layer surrounds the Earth, extending to about five kilometers above the Earth’s surface.
The following experiment is an easy one that you can do at home. But make sure that you are supervised, because you will need to use matches. Now foe the experiment!
What you need
·A hard-boiled egg without the shell
·A bottle with a neck slightly smaller than the egg
·A piece of paper
·A match
Metheod
1) Check that the paper will sit firmly on the neck of the bottle.
2) Tear the paper into strips and put the strips into the bottle.
3) Light the paper by dropping a burning match into the bottle.
4) Quickly sit the egg on the neck of the bottle.
Result
Astonishingly, the egg will be sucked into the bottle. Your friends will be amazed when you show them the experiment. But be careful when you handle matches.
Why it happened
As the paper burns, it needs oxygen and uses up the oxygen (air) in the bottle. The egg acts as a seal in the neck of the bottle, so no more air can get inside. This reduces the air pressure inside the bottle. The air pressure must equalize, so more air from outside must enter the bottle. The outside air pressure against the egg and then the egg is pushed into the bottle! The proves that air is all around and that it is pressing down on it.
64.Why is there the need to take care when you are doing the experiment?
A.The bottle could break.
B.You need to light the paper with a match.
C.The egg needs to be shelled.
D.The egg has to be perfectly placed on the neck of the bottle.
65.In the experiment, the burning inside the bottle can___.
A.equalize the air pressure inside and outside
B.make a seal in the neck of the bottle
C.finish up the oxygen inside the bottle
D.produce more oxygen inside the bottle
66.How did the egg put into the bottle?
A.The oxygen inside the bottle sucked the egg in.
B.It became salt without the shell.
C.The neck of the bottle was wide enough.
D.The outside air pressure forced it into the bottle.
67.The experiment is carried cut to prove ______.
A.water pushes on your body when you swim underwater.
B.the earth is surrounded by a layer of air called the atmosphere.
C.the pressure of air around us has a powerful force.
D.the air pressure is not equalized around us.
查看习题详情和答案>>“Where is the bus? Why is it always late?” I asked myself. I was going to be late _31___the manager wasn’t going to be pleased. “Thank God, here it is!” The bus came round the corner and I got on. Ten minutes later I was walking into the __32___where I work. “Twenty-five past nine. I hope the manager doesn’t notice.” But I was not _33___.
“Smith!” shouted the manager. “Late again. What’s your _34___ this time?” “I am afraid the bus was late, Mr. Brown.” “ Get up earlier tomorrow! Anyway, go to your place at the counter(柜台). We’ll be opening in a few minutes.”
My first customer was a pretty girl wearing a red dress. _35___ her was a young man of about 23.He seemed very ____36____, and every few seconds he looked towards the main entrance. The girl drew some money and __37___about opening an account. I gave her necessary 38__and she went out. Then I noticed a tall man by the door, carrying something ___39_ _with brown paper. Turning to my next customer, I was frightened to see a gun sticking out of his coat. The next moment a loud noise ___40 __my ears. Everything went black. I was falling… It seemed to be a long time ___41___ I opened my eyes and I found myself in bed! Still shaking from the memory of this terrible dream, I got dressed and ran out of the house. ___42___ the bus wasn’t on time, and I got to the bank at 9:25.
“Smith!” the manager cried out in a voice like thunder. “__43___of your excuses! Start work at once!” To my ___44__ the first customer was a girl ___45__ a red dress and behind her stood a man carrying something wrapped in brown paper. The Dream! Sometimes life is full of coincidences (巧合)!
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I was watching a TV series one night when I took in one scene. A man was seeking his community votes, and people 36 wanted to know why they should give him their 37 . He took them to his house and on every 38 in his house was the word “Faith” pasted. People raised lots of 39 to find out why the word was pasted on his mirrors. He said, “My dad often 40 me to believe that as long as you have 41 , you should have faith. Every time you look in to the mirror, you’re looking at yourself and see ‘Faith’. ”
The 42 I learned from this is simple — faith is a living thing and in the same way we’re all 43 given 24 hours a day and we’re all given the same measure of faith. Faith keeps us going when things get 44 ! Why is some people’s faith stronger than that of others? Exercise! If we choose to exercise our faith, it will 45 ; but if we choose not to, it remains weak. Some people might 46 that they don’t have faith, but we all practice faith every day even if we don’t 47 it was faith. Daily 48 , such as studying, investing or reaching for a dream, take faith.
Faith 49 hearing and doing. I made a decision yesterday — to 50 reading the newspaper full of too much sad and 51 news. Why? Because I 52 there was a drop of my mental state after reading the newspapers.
Faith, when it’s put to 53 , becomes a beautiful thing, It lifts your mental state to a higher place that 54 you to raise yourself up and declare, “Yes we can.” So make the decision today to strengthen your faith by 55 it.
1. A.mostly B.briefly C.bravely D.finally
2. A.support B.instruction C.pity D.information
3. A.wall B.mirror C.picture D.book
4. A.questions B.voices C.rules D.standards
5. A.teaches B.permits C.forces D.promises
6. A.friendship B.breath C.wealth D.success
7. A.view B.lesson C.choice D.example
8. A.extremely B.freely C.equally D.frequently
9. A.strange B.difficult C.funny D.different
10. A.stay B.return C.slow D.grow
11. A.realize B.argue C.understand D.predict
12. A.agree B.appreciate C.admire D.acknowledge
13. A.services B.steps C.tasks D.experiment
14. A.comes from B.dreams of C.feels like D.keeps on
15. A.consider B.delay C.stop D.risk
16. A.various B.genuine C.negative D.latest
17. A.heard B.noticed C.declared D.explained
18. A.check B.list C.sleep D.work
19. A.warns B.causes C.orders D.forbids
20. A.forming B.exercising C.obtaining D.thinking
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The rain was coming down heavily and I was going to be late for an important conference. Dressing up quickly, I called for a taxi, that it would be faster than the subway.
It wasn't.
After a long wait, I finally got one, but the traffic was heavy. I looked at my from time to time. Just as the traffic started moving, the driver a man up ahead in a wheelchair.
“Wouldn't he be cold sitting right there!” the driver cried and began to .
I could see there would be another 20 minutes' — him into the cab, folding up his chair and putting it into the taxi's small , then dropping him off who knows where.
“What are you doing?” I shouted to the driver.
As the came out, I wanted to take them back. The wrongness of my to the driver shocked me. Why did I let out the shout?
The driver me and we continued the journey. Eventually I got out of the taxi and
to the office. As I ran, I understood that, though it wasn't my duty to take the time to help others, I shouldn't have the driver's stopping. I should have been able to see beyond my impatience to notice what was most inerrant (不会错的). Whenever I think of this incident, this is my : I am not a self-centered person, but I still feel
of being self-centered. Living a busy life in a fast-paced big city, do we still need to stop to help those who are in need of help?
1.A. reminding B. expecting C. realizing D. attempting
2.A. computer B. document C. message D. watch
3.A. witnessed B. picked C. spotted D. observed
4.A. pull over B. take off C. pass by D. run away
5.A. complaining B. suffering C. waiting D. struggling
6.A. indicating B. recommending C. lifting D. urging
7.A. trunk B. box C. window D. carriage
8.A. anxieties B. words C. results D. comments
9.A. reaction B. request C. comment D. suggestion
10.A. comforted B. prevented C. encouraged D. ignored
11.A. escaped B. fled C. settled D. flooded
12.A. excited at B. thought about C. made fun of D. complained about
13.A. feeling B. motto C. dream D. determination
14.A. skillfully B. strangely C. particularly D. hopefully
15.A. proud B. aware C. ashamed D. confident
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Why is reading so important? Joseph Addison once said, “Reading is to the mind what exercise is ? 1. the body.” I am sure you ? 2.? have heard this quote. Reading is a great hobby, ? 3.? makes you discover yourself. Reading good stories can help you solve some problems in your own life. Besides, reading ? 4.?? sets a good example to younger generations.
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Sadly, people nowadays seem to have totally lost interest in this activity. Children are busy with computer games, ? 5.? adults use their cell phones or computers to search for information. 6.? seems that people have forgotten ? 7.? importance of reading. Anybody can use the Internet to look for information, but the sources are ?? 8. as reliable as a book.
To open a book is always beneficial! Don’t spend all your spare time on the computer screen or cell phones.
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