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What makes it rain? Rain falls from clouds for the same reason anything falls to Earth. The Earth"s gravity pulls it. But every cloud is made of water droplets or ice crystal(冰晶). Why doesn"t rain or snow fall constantly from all clouds? The droplets or ice crystals in clouds are extremely small. The effect of gravity on them is slight. Air currents move and lift droplets so that the net downward amount of water is zero, even though the droplets are moving constantly.
It can be seen that droplets and ice crystals behave somewhat like dust in the air in a beam of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about
without fixed direction. But in fact dust particles(分子) are much larger than water droplets and they finally fall. The average size of a cloud droplet is only 0.0004 inch in diameter(直径). It is so small that it would take sixteen hours to fall half a mile in perfectly still air, and it doesn"t fall out of moving air at all. Only when the droplet grows to a diameter of 0.008 inch or larger can it fall from the cloud. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size larger enough to fall out is the cause of rain and other forms of precipitation. This important growth process is called "coalescence".
小题1: Ice crystals do NOT immediately fall to Earth because           .
A.they are kept up by air currents
B.most of them change into steam
C.they combine with other chemicals in the atmosphere
D.their electrical charges draw them away from the earth
小题2: The underlined word "random" in line 10 most probably means            .
A.unpredictableB.strictC.independentD.abnormal
小题3:What can be inferred about drops of water larger than 0.008 inch in diameter?
A.They never occur.
B.They are not affected by the force of gravity.
C.In moving air they would fall to earth.
D.In still air they fall a speed of thirty-two miles per hour.
小题4: How much bigger is the rain drop than a loud droplet?
A.200 times bigger
B.1,000 times bigger
C.100,000 times bigger
D.1,000,000 times bigger

答案
AACD
解析

核心考点
试题【What makes it rain? Rain falls from clouds for the same reason anything falls to】;主要考察你对题材分类等知识点的理解。[详细]
举一反三
Remembering names is an important social skill. Here are some ways to master it.
Recite and repeat in conversation(谈话,交往).
When you hear a person’s name, repeat it. Immediately say it to yourself several times without moving your lips. You could also repeat the name in a way that does not sound forced or artificial(矫揉造作的,不自然的).
Ask the other person to recite and repeat.
You can let other people help you remember their names. After you’ve been introduced to someone,ask that person to spell the name and pronounce it correctly for you. Most people will be pleased by the effort(努力) you’re making to learn their names.
Admit you don’t know.
Admitting that you can’t remember someone’s name can actually make people relaxed. Most of them will feel sympathy if you say, “I’ m working to remember names better. Yours is right on the tip of my tongue. What is it again?”
Use associations(联络,联系).
Link(联系) each person you meet with one thing you find interesting or unusual. For example, you could make a mental note:“Vicki Cheng — tall, black hair.” To reinforce (加强) your associations, write them on a small card as soon as possible.
Limit the number of new names you learn at one time.
When meeting a group of people, concentrate on(集中精力) remembering just two or three names. Free yourself from remembering everyone. Few of the people in mass introductions expect you to remember their names. Another way is to limit yourself to learning just first names. Last names can come later.
Go early.
Consider going early to conferences(会议), parties and classes. Sometimes just a few people show up(到场) on time. That’s fewer names for you to remember. And as more people arrive, you can hear them being introduced to others — an automatic (无意识的)review for you.
小题1:..How will most people feel when you try hard to remember their names?
A.They will be moved.B.They will be annoyed.
C.They will be delighted.D.They will be discouraged.
小题2:.If you can’t remember someone’s name, you may ________.
A.tell him the truthB.tell him a white lie
C.ask him for pityD.ask others to help you
小题3:..When you meet a group of people, it is better to remember________.
A.all their namesB.a couple of names first
C.just their last namesD.as many names as possible
小题4:..What does the text mainly tell us?
A.Tips on an important social skill.B.Importance of attending parties.
C.How to make use of associations.D.How to recite and repeat names.

题型:不详难度:| 查看答案
Whether you’re headed to another country for business or pleasure, it is likely that you need to keep in touch with family or business partners in the United States. But if you plan to do that using your cellphone, you could have an unwelcome surprise—U.S. cellphones don’t work abroad. U.S. companies use different forms of technology, not like most of the international community, including Europe.
However, there is an easy, cost-effective solution to staying in touch while you’re traveling. You can rent a phone that is guaranteed(保证)to work in the countries you’re visiting. Roadpost offers a 30-day cellphone rental plan that includes free incoming calls, free voicemail and call waiting services.
The service is convenient and simple. You can place your order online and your phone will be shipped to arrive on the date you want. If an unexpected business trip comes up, Roadpost can provide next-day delivery for most cities. In addition to the phone, Roadpost provides a spare battery, travel charger and a leather carrying case.
When your phone is shipped from Roadpost, you receive an e-mail confirmation(确认)that contains your international cellphone number so you can leave it with family members and business partners; Roadpost even provides business cards preprinted with your international phone number.
Those who don’t want to be without e-mail while traveling can rent an international BlackBerry. It can be hard to stay in touch by e-mail when traveling. With an international BlackBerry, you can e-mail as much as you like, without worrying about an expensive bill. If you’re traveling to very remote areas, you may want to consider renting a satellite phone, because it receives its signals from satellites, this phone works anywhere on the planet, including oceans and mountains. When you return, simply ship the phone or BlackBerry back to Roadpost using the return kit the company provides.
小题1:The first paragraph mainly tells us that_________.
A.Americans need to change their cellphones
B.European form of technology is different from America’s
C.U.S. cellphones don’t work abroad
D.Americans who go abroad will meet an unwelcome surprise
小题2:According to the text,it can be inferred that__________.
A.an international BlackBerry is only used to send e-mail
B.Roadpost can offer cellphones using in different areas
C.you should select a bag used to send your cellphone
D.Roadpost sells the best cellphones
小题3:Which of the free services can you get from Roadpost?
A.Voicemail.B.Sending e-mail.
C.Shipping the phone back.D.Call waiting services.
小题4:Which of the following will help you a lot in mountainous areas?
A.BlackBerry.B.The return kit.C.E-mail.D.Satellite phones.

题型:不详难度:| 查看答案
请认真阅读下面短文,并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。注意:每个空格只填1个单词。
In the United States, engineering is a profession that has been dominated(支配)historically by men. Even today, it"s still true that few women become civil or chemical or mechanical(机械的) engineers, but that"s something www.EngineerGirl.org aims to change. Young women who visit the web site can find out about a great career choice they might not have considered.
"Women are very much underrepresented in engineering and in engineering education programs and then of course, down the road, in the engineering workforce. So only about 20 percent of engineering undergraduate degrees go to women, and then only about nine percent of working engineers are women."
Mary Mattis is the National Academy of Engineering, says the EngineerGirl website aims to reach young women around ages 11 through 14, when they are just getting old enough to start thinking about their futures.
"We know from the research that middle-school girls are at a critical(关键的)point in their lives, and that it"s a time when we need to reach them, both with an understanding, increasing their awareness of interesting fields in engineering, what a wonderful productive and exciting career you can have as an engineer. But we also need to reach them at that time because you have to take certain courses, and you can"t start thinking about taking those courses when you"re a junior in high school."
Engineering is a demanding course of study ---there is a lot of science and mathematics, for many girls and even boys, that can be challenging. But Ms. Mattis says that the EngineerGirl website stresses that engineering can also be fun and exciting.
"It"s about designing things. It"s about changing the world for people. It"s about making a difference. And, in addition, you can make a good living, you can be independent economically by becoming an engineer. All of those things are messages that girls need to get."
While most engineers go into traditional fields such as mechanical and electrical engineering, the EngineerGirl site also highlights unusual engineering careers in fields such as sports engineering and --- believe it or not --- chocolate engineering.
"There"s a section called "why be an engineer," and that talks about the many opportunities and increasingly different opportunities like with bio-engineering and environmental engineering, some fields that might appeal to girls who want to make a difference or have a meaning for their careers beyond earning an income."
Even if you are not a girl in the target age group, there’s a lot of interesting information on the site, including biographies(传记)of some notable(显著的)women engineers.
Title : Website(1)______ Girls to learn Engineering
Present (2)_____ for the engineering profession in the USA
The majority of men take up the profession throughout(3) ______, while only a small number of women work as engineers.
(4)_____ of the website
To  make  young  women (5)_____ of interesting  fields  in engineering and what productivity and(6)_____ the career of being engineers can bring them.
(7)_____ of being engineers
* It can be fun and exciting.
* It can(8)_____ the world for people.
* You can make a good living.
* You can gain economic(9)_____ by becoming an            engineer.
Other fields concerning engineering 
Various opportunities are talked about like bio-engineering and engineering (10) _____ to sports, and even chocolate

题型:不详难度:| 查看答案
There was a park near my home. But I didn’t go there very often. Many people said there was nothing special. One afternoon I went into the park and found it was really small. I walked quickly because there wasn’t much to see. I walked for some time and found myself standing in front of two paths. 71  I found that the two paths were different from each other.
The left one was wide and clean. There were lots of flowers on both sides of the path. Though the flowers weren’t very beautiful, they made me feel good. I decided to take this path. But wait! I looked at the right one. The path didn’t look nice.  72  Grass grew everywhere. For a long time I couldn’t make up my mind.
  73  It wasn’t nice , but I didn’t want to give up. At last, I came to the end of the path. Ah! There was a small garden there. It was beautiful, perhaps the most beautiful garden I had ever seen.  74  
Many people told me that there was nothing much to see in the park. Now I’d like to tell them that if they had followed the right way, they would have felt differently. But when I told them about what I had seen in the park, they just smiled at me without saying a word. I knew they didn’t believe me. They couldn’t even remember that path because it was so small.
  75  Don’t be afraid to choose a different path. You may get a big surprise!
A.There is nothing that I want to see.
B.It looked like it had not been cleaned for months.
C.After a while a strange feeling made me follow the dirty path.
D.“ Which way should I go?” I asked myself. I looked at one way, then the other.
E. I told them what happened.
F. My trip to the park that day made me understand something about life.
G. There were trees, flowers and chairs. I thought it was the nicest part of the park.
题型:不详难度:| 查看答案
Time spent in a bookshop can be most enjoyable, whether you are a book-lover or merely you are there to buy a book as a present. You may even have entered the shop just to find shelter from a sudden shower. Whatever the reason, you can soon become totally unaware of your surroundings. You soon become engrossed in some book or other, and usually it is only much later that you realise you have spent far too much time there and must dash off to keep some forgotten appointment—without buying a book, of course.
This opportunity to escape the realities of everyday life is, I think, the main attraction of a bookshop. There are not many places where it is possible to do this. You can wander round such places to your heart"s content. If it is a good shop, no assistant will disturb you with usual greetings, "Can I help you, sir?" Of course you may want to find out where a particular section is. Then, and only then, are his services necessary. However, when he has led you there, the assistant should retire carefully and look as if he is not interested in selling a single book.
You have to be careful not to be attracted by the variety of books in a bookshop. It is very easy to enter the shop looking for a book on ancient coins and to come out carrying a copy of the latest best-selling novel. This sort of thing can be very dangerous. Apart from running up a huge account, you can waste a great deal of time wandering from section to section.
小题1:.
. Which may not be included in the writer"s experiences while he is in a bookshop?
A.Getting relaxed without buying a book.
B.Quarrelling with the shop assistant.
C.Buying other books instead of those he wanted.
D.Forgetting some important appointment.
小题2:.
. What does the writer mean by saying "time spent in a bookshop can be most enjoyable"?
A.You may free yourself from the real life.
B.Reading is free of charge there.
C.There is nobody disturbing you there.
D.You can enter without any certain reason.
小题3:.
What does the underlined wordengrossed most probably mean in the first paragraph?
A.Lost.B.Forbidden.C.Puzzled.D.Impressed.
小题4:.
. The writer wrote the passage in order to ________.
A.suggest a good way of running a bookshop
B.encourage people to do some reading in bookshops
C.share his experience in bookshops
D.give some advice on buying books in a bookshop

题型:不详难度:| 查看答案
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