The surprising experiment I am about to describe proves that air is all around you and that it presses down upon you. Air pressure is a powerful force. When you swim underwater, you can feel water pushing on 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 (層) 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 (監(jiān)督), because you will need to use matches. Now for the experiment.

What you need

● hard-boiled egg without the shell

● A bottle with a neck slightly smaller than the egg

● A piece of paper

● A match

Method

1) Check that the egg will sit firmly on the neck of the bottle.

2) Tear the paper into pieces and put them 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 scale 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 presses against the egg, and then the egg is pushed into the bottle! This proves that air is all around and that it is pressing down on us.

1.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 (脫殼).

D. The egg has to be perfectly placed on the neck of the bottle.

2. How did the egg get into the bottle?

A. The oxygen inside the bottle sucked the egg in.

B. It became soft without the shell.

C. The neck of the bottle was wide enough.

D. The outside air pressure forced it into the bottle.

3.The experiment is carried out 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

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)源：2015-2016學(xué)年外研版必修3高一模塊測(cè)評(píng)英語(yǔ)試卷1（解析版） 題型：閱讀理解

閱讀下列短文,從每題所給的四個(gè)選項(xiàng)(A、B、C和D)中選出最佳選項(xiàng)。

Europe is surely among the most popular tourist destinations(目的地) around the world.However,one problem that anyone talks about is how to plan a trip with enough time to the various destinations in Europe.Johnson is one of the travelers extremely interested in Europe.Here he uses his experience to tell you about the various Europe tour packages(旅游套票).

The Europe tour packages are designed to offer much more than a simple trip around Europe.Usually,a Europe tour package includes all kinds of things for tourists to enjoy their trips to Europe.First the packages offer air tickets for the best flights from the best airlines to tourists and let them fly to Europe from anywhere.Different Europe tour packages also offer chances to stay in the best hotels.Besides,when it comes to sightseeing Europe packages provide a visit to some of the most popular tourist spots around Europe.For example,one day you will be at the Eiffel Tower in Paris,and the very next day you will be in the Swiss Alps.These Europe packages are designed to pack all the beautiful destinations and put them in front of you for a wonderful holiday.This is the most important thing.

Now you must be thinking about how to get one of these Europe packages.The best way is to go on the Internet,and look for the right one for you.There are many Europe packages to choose from,and the key is to simply go for the ones that suit your budget(預(yù)算).

1.The passage is written to .

A.attract more tourists to European countries

B.tell us something to pay attention to during traveling

C.stress the importance of preparations before traveling

D.introduce something about Europe tour packages

2.What is many tourists’ problem when they plan to visit Europe?

A.How to book air tickets in time.

B.How to fix time reasonably.

C.How to choose famous attractions.

D.How to save some time to travel.

3.A Europe tour package will make you enjoy the trip by .

A.providing best flights,hotels and sightseeing spots

B.letting one visit many places of interest in the world

C.saving a great deal of money for you

D.offering excellent online service to you

4.If you want to choose from the tour packages,you have to first consider .

A.if the time is right for you

B.where to get the package

C.how much money you can afford

D.the way of traveling

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2015-2016學(xué)年寧夏高二下期末英語(yǔ)卷（解析版） 題型：閱讀理解

Computer Technician (Part Time Student Helper)

· Government Department

· Flexible schedule

· Good opportunity for the young adults

Our client, a Government Department, is now looking for numbers of Part Time Computer Technicians to join their supporting team.

Job Responsibilities

· Responsible for answering queries to end users on the use of computer and electronic systems and facilities

· Provide general technical support to end users

·Handle, on regular health checks on equipment, reset problem terminals and reinstall software

Job Requirements:

·Diploma/ higher diploma in Computer Science or related discipline obtained from Hong Kong University / IVE or above

·Part-time experience in Customer Services and/or IT support is an advantage

· Good at verbal and written English, Cantonese and Mandarin

· With basic knowledge or experience in IT networking

· Good working attitude, energetic and self-motivated candidate is highly preferred

· Students in Year 1 and Year 2 are preferred

· Training will be provided

Attractive remuneration (報(bào)酬) package will be negotiated to the right candidate.

Interested parties please email a MS Word Version resume and expected salary to technology @man power professional, com. hk (CC: iris. cheung @ manpower-professional. Com. hk) and quote the job reference.

Job Ref: 506-111213-IR

Job Type: Contract

Location:

Start Date: ASAP

Duration:

Salary/Rate :

Contact: Iris Cheung

Open To: Hong Kong Residents Only

Submitted: 12/04/2016

1.The main purpose of this passage is to_________.

A. advertise a job B. introduce a company

C. introduce a career D. advertise a course

2.The job has a lot of benefits EXCEPT________.

A. working in a government department

B. a high salary

C. flexible working plan

D. opportunities for young adults

3.If someone wants to apply for the job, he must________.

A. have graduated from IVE

B. have been trained before

C. be a student in Year 1

D. submit his applications by 12/04/2016

4.The job will be offered only to__________.

A. citizens from Hong Kong B. university students

C. computer technicians D. young people

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2015-2016學(xué)年吉林毓文中學(xué)高一下期中考試英語(yǔ)卷（解析版） 題型：完成句子

請(qǐng)根據(jù)課文背誦，在橫線上填入所缺內(nèi)容，要求與原文一模一樣，否則該小題不得分。每個(gè)空只能填入一詞，并將答案寫(xiě)在答題卡的相應(yīng)位置。

1.--May we ask what you’re doing in this country and what your plans are? --Well, I can’t say that I have any plans. I’m hoping to find work. As a matter of fact, I landed in Britain _____ ______.

2.--And it was the ship that brought you to England. –Yes. The fact is that I earned my passage by working as an unpaid hand, which______ ______ my appearance. I went to the American embassy to seek help, but…(the brothers smile at each other.)

3.It exploded loudly with fire and rock. They were ______ ______ to produce carbon dioxide, nitrogen, water vapour and other gases, which were to make the earth’s atmosphere.

4.Water had also appeared on other planets like Mars but, _______the earth, it had disappeared later. It was not immediately obvious that water was to be fundamental to the development of life.

5.Because of the Great Lakes, they learned, Canada has more fresh water than______ ______________ in the world. In fact, it has one-third of the world’s total fresh water, and much of it is in the Great Lakes.

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2015-2016學(xué)年黑龍江雙鴨山一中高二6月考英語(yǔ)卷（解析版） 題型：短文改錯(cuò)

短文改錯(cuò)

Dear Tracy，

Although I'm 16 years old，but my father still treats me as a careless children. He doesn’t value my opinions .He is very strict with me and often punishes me about leaving things lying around in the house while he did this all time. I think he fails to set an example to me to follow. But he often say：“Do as I say，not as I doing.” Even worse，he points out my past mistakes to our guests, making me feel hurting. I love my father, but I can’t bear what he does. I have been tried many times to talk with he, but he never listens. Please help me.

Puzzled

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2015-2016學(xué)年河北冀州市高一下期末（A）英語(yǔ)卷（解析版） 題型：短文改錯(cuò)

短文改錯(cuò)

文中共有10處語(yǔ)言錯(cuò)誤，每句中最多有兩處。

增加：在缺詞處加一個(gè)漏字符號(hào)（∧），并在其下面寫(xiě)出該加的詞。

刪除：把多余的詞用斜線（＼）劃掉。

修改：在錯(cuò)的詞下劃一橫線，并在該詞下面寫(xiě)出修改后的詞。

注: 1.每處錯(cuò)誤及其修改均僅限一詞；

2.只修改10處，多者（從第11處起）不計(jì)分。

It was 6 pm when we arrived Belfast, so we went straight to the hotel that we booked online to check in after we got on the plane. On our way to the downtown, the taxi driver brief introduced the city, which had been in chaos for almost 30 years until the end of next century. After dropped our bags, we wandered around in the streets. The city was peacefully and people seemed to be enjoying their life very much. The place that we had our dinner was called “The Crown”, a pub dated back to 1826, when the first train ran from Belfast to Lisburn. We met two European girls having Chow Mein, fried noodles, when we were having a rest in the hall of the hotel later. They told us they have bought the noodles in a Chinese restaurant named Eastern Land. We decided not to go there the next evening so that we could taste it.

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2015-2016學(xué)年河北冀州市高一下期末（A）英語(yǔ)卷（解析版） 題型：閱讀理解

Today’s museums include plenty of high culture, but you can still find shrines（圣地）to the extraordinary. Here’s a look at five curious museum stops across Canada.

Vancouver Police Museum

The setting, terrible enough, is the old Coroner’s（驗(yàn)尸官）Court and forensics lab, including the morgue(room where dead bodies are kept). Artifacts, from the 1870s on, include badges, uniforms, police equipment, items from criminals, and even preserved organs—all in all an arresting experience.

Vulcan Tourism & Trek Station

Designed to resemble a spacecraft, the Treck Station celebrates Vulcan’s coincidental relationship to Mr. Spock’s planet, Go to a building that features an 800-piece collection of Star Trek memorabilia — including Spock’s ears and floor-to-ceiling space paintings. If you want to know more about it, click here: http//www. Vulcantourism. com

Accordion（手風(fēng)琴）Museum

Through instruments, photos and recordings, the museum traces the history of the accordion and its influence on Quebec culture. They’ve even acquired Asian instruments that show the use of the free reed— call them ancient ancestors of the accordion—that date back 4000 years.

Chocolate Museum

It’s chocoholic heaven — whole museum featuring displays on how chocolate is made, hands-on exhibits, collections of historic chocolate boxes, and antique candy- making equipment and, of course, lots of chocolate treats ,located in an old candy factory building. Click below to learn all about their hours and admission rates. http:// www. Chocolate museum .com

Potato museum

A 14--foot high potato greets you at what’s billed as the world’s largest exhibit of potato artifacts. Explore the humble potato’s role in the economy, a collection of farm tools related to growing and harvesting potatoes, Hall of Fame.

1.If you are very interested in thrilling movies, you will probably be attracted by .

A. Accordion Museum B. Vancouver Police Museum

C. Potato Museum D. Chocolate Museum

2.We can infer from the passage that the ancestors of accordion originated in .

A．Canada B．America C．Asia D．Africa

3.The passage is most likely to be taken from .

A．a(chǎn) magazine B．a(chǎn) newspaper

C．a(chǎn) website D．a(chǎn) brochure

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2015-2016學(xué)年貴州都勻一中高二下開(kāi)學(xué)考英語(yǔ)試卷（解析版） 題型：完形填空

完形填空

閱讀下面短文，從短文后各題所給的四個(gè)選項(xiàng)（A、B、C和D）中，選出可以填入空白處的最佳選項(xiàng)。

Once upon a time in a land far far away, there was a __________old man who loved everything. Animals, spiders, insects…

One day _________ walking through the woods the nice old man found a cocoon(繭) of a butterfly. He __________ it home. A few days later, a small_________ appeared；he sat and watched the butterfly for several hours __________ it struggled to force its body through that little hole. Then it seemed to__________ making any progress. It appeared as if it had gotten as far as it could and it could go _________ farther.

Then the old man decided to help the __________, so he took a pair of scissors and _________ the remaining bit of the cocoon.

The butterfly then came out _________.

_________it had a swollen body and small, shriveled(皺縮的) wings. The old man __________to watch the butterfly because he expected that, at any moment, the wings would__________ to be able to support the body, which would contract in time. Neither happened ! _________ , the butterfly spent the rest of its life crawling(爬行) around with a swollen body and shriveled wings. It never was able to _________.

What the man in his kindness and haste did not understand was that the restricting_________ and the struggle required for the butterfly to __________ the tiny opening were nature’s way of forcing fluid(液體) from the body of the butterfly into its wings so that it would be ready for flight once it achieved its__________ from the cocoon.

Sometimes __________ are exactly what we need in our life. If we were allowed to go through our life without any challenges, it would weaken us. We would not be as __________ as what we could have been. And we could never fly.

1.A. cold B. kind C. polite D. tiresome

2.A. unless B. if C. while D. because

3.A. took B. moved C. circulated D. dashed

4.A. sign B. shadow C. shade D. opening

5.A. and B. until C. as D. then

6.A. stop B. prevent C. appeal D. adapt

7.A. any B. more C. no D. much

8.A. cocoon B. butterfly C. animal D. insect

9.A. take down B. take apart C. cut down D. cut open

10.A. greedily B. easily C. hardly D. quickly

11.A. Generally B. Even C. So D. But

12.A. sought B. lasted C. continued D. began

13.A. enlarge B. shorten C. tighten D. darken

14.A. In conclusion B. In time C. In fact D. In particular

15.A. walk B. fly C. flee D. run

16.A. wing B. tale C. subject D. cocoon

17.A. get out B. get through C. get away D. get down

18.A. freedom B. outcome C. balance D. reliability

19.A. struggles B. passions C. manners D. spirits

20.A. weak B. intelligent C. gifted D. strong

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2016年全國(guó)普通高等學(xué)校招生統(tǒng)一考試英語(yǔ)（新課標(biāo)卷2卷精編版） 題型：七選五

根據(jù)短文內(nèi)容，從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。

A garden that’s just right for you

Have you ever visited a garden that seemed just right for you, where the atmosphere of the garden appeared to total more than the sum(總和) of its parts? 1. . But it doesn’t happen by accident. It starts with looking inside yourself and understanding who you are with respect to the natural world and how you approach the gardening process.

● 2.

Some people may think that a garden is no more than plants, flowers, patterns and masses of color. Others are concerned about using gardening methods that require less water and fewer fertilizers(肥料). 3. . However, there are a number of other reasons that might explain why you want to garden. One of them comes from our earliest years.

●Recall(回憶)your childhood memories

Our model of what a garden should be often goes back to childhood. Grandma’s rose garden and Dad’s vegetable garden might be good or bad, but that’s not what’s important. 4. —how being in those gardens made us feel. If you’d like to build a powerful bond with your garden, start by taking some time to recall the gardens of your youth. 5. then go outside and work out a plan to translate your childhood memories into your grown-up garden. Have fun.

A. Know why you garden

B. Find a good place for your own garden

C. It’s our experience of the garden that matters

D. It’s delightful to see so many beautiful flowers

E. Still others may simply enjoy being outdoors and close to plants

F. You can produce that kind of magical quality in your own garden, too

G. For each of those gardens, writer down the strongest memory you have

查看答案和解析>>

同步練習(xí)冊(cè)答案