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Just as the world’s most respected scientific bodies have confirmed that the world is getting hotter, they have also stated that there is strong evidence that humans are driving the warming. Countless recent reports from the world’s leading scientific bodies have said the same thing. For example, a 2010 summary of climate science by the Royal Society stated that: “There is strong evidence that the warming of the Earth over the last half-century has been caused largely by human activity.”
The idea that humans could change the planet’s climate may be counter-intuitive(与直觉不符的), but the basic science is well understood. Each year, human activity causes billions of tons of greenhouse gases to be released(释放)into the atmosphere. As scientists have known for years, these gases hold heat that would otherwise escape to space, wrapping the planet in an invisible blanket.
Of course, the planet’s climate has always been changing thanks to “natural” factors(因素) such as changes in solar or volcanic(火山的)activity, or cycles relating the Earth’s going around the sun. According to the scientific literature, however, the warming recorded to date matches the pattern of warming we would expect from a build-up of greenhouse gas in the atmosphere – not the warming we would expect from other possible causes.
Even if scientists did discover another reasonable explanation for the warming observed so far, that would beg a difficult question. As Robert Henson puts it in The Rough Guide to Climate Change: “If some newly discovered factor can account for the climate change, then why aren’t carbon dioxide(二氧化碳)and the other greenhouse gases producing the warming that basic physics tells us they should be?”
The only way to prove with 100% certainty that humans are responsible for global warming would be to run an experiment with two identical Earths – one with human influence and one without. That obviously isn’t possible, and so most scientists are careful not to state human influence as an absolute certainty.
In most scientists’ opinion, the global warming is mainly caused by ________.

A.solar activity
B.volcanic activity
C.the Earth’s going around the sun
D.human activity

The text is developed by ________.

A.giving typical examples
B.following the order of space
C.analyzing a theory and arguing it
D.comparing and finding differences

The underline word “identical” means ________.

A.totally different
B.exactly the same
C.extremely important
D.relatively independent

Which of the following can be the best title?

A.Are All the Scientists Really Scientific?
B.Where Is Global Warming Leading Us to?
C.Are Humans Definitely Causing Global Warming?
D.What’s Relation of Global Warming and Greenhouse Gases?
科目 英语   题型 阅读理解   难度 中等
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相关试题

Proverbs(谚语) are quite common in spoken English. We do not normally put them in a composition or letter. Sometimes it is helpful if you know what common proverbs mean. Here are a few examples:
Once bitten, twice shy. If a dog bites me, I shall be twice as careful in future when I see it. This proverb is also used to apply to many things and not only to dogs. If you have been cheated at a shop, you will not go to the same shop again.
A bird in the hand is worth two in the bush. If I am a hunter, trying to catch birds, it is better to catch one bird than to see two birds in a bush but not be able to catch them. Thus this means that what you have already got is better than the chance of being able to get something bigger in the future.
Too many cooks spoil the broth(soup). When too many people do something together, they get in each other’s way and cannot do a good job.
To pour oil on troubled waters Is to try to calm things down. Oil is lighter than water. If a ship is in trouble at sea, another ship may come to help it. The second ship can send small boats to rescue people. However, it may first pour oil on the sea to make the sea less rough.
Don't be a dog in a manger(马槽). Means “ Don’t be selfish.” In a stable(马厩), the manger is the place where the horse’s food is put. Sometimes a dog will sleep in the manger and bard when a horse comes to get its food. The dog does not want to eat the hay in the manger but it will not let the horse eat it.
He’s sitting on the fence. Means that somebody will not say whether he is in favour of a plan or against it. He is sitting on a fence between two opposing sides, perhaps waiting to see which side will win.
He who pays the piper calls the tune. A piper is a musician . The man who employs or pays a musician can say what tunes the man will play. Thus this means that if a man provides the money for a plan, he can say how it will be carried out.
You can’t get blood out of a stone means that you can’t get something out of a person who has not got any of the things you want. For example, you cannot get a million dollars from a poor man.
Peter had a bicycle which was much too small for him but he did not want to let his younger brother ride on it. His mother was angry and said to him : “______”.

A.You cannot get blood out of a stone B.Don’t be a dog in a manger
C.The early bird gets the worm D.Don’t be a horse in the manger

Mr Wang paid for a new school. Some people did not like the design of the school but they did not argue with Mr Wang because ________.

A.he was sitting on the fence B.once bitten, twice shy
C.he who pays the piper calls the tune D.a bird in the hand is worth two in the bush

Mrs Chen wanted to buy a new dress. Her husband suggested that she buy it from a shop near their home. Mrs Chen disagreed because she had been cheated by that shop. Then she said: “ I won’t go there again because___.”

A.a bird in the hand is worth two in the bush B.I am sitting on the fence
C.Once bitten, twice shy D.too man cooks spoil the broth

Mr brown had quite a good job in Hong Kong but he thought that if he went to Singapore he might get a much better job with more money and a large house. His wife did not want him to leave his job in Hong Kong and she warned him that _____.

A.a bird in the hand is worth two in the bush B.too many cooks spoil the broth
C.you cannot get blood out of a stone D.he who pays the piper calls the tune

I am Sergey Brin! I was born in Moscow. In 1979,when I was 5, my family immigrated to California, USA . I remember that on my 9th birthday, I got my first computer “Commodore 64”.
Later I graduated with honors in the University of Maryland in Mathematics and IT. The main field of my science research was the technologies used to collect data from unsystematic sources as well as large quantities of texts and science data. I was the author of dozens of articles in leading American academic magazines.
The greatest event in my life happened when in 1998 I was preparing for the defense(论文答辩) of my Doctor’s degree in the Stanford University. There the fate made me meet Larry Page—a young computer genius. Larry belonged to the intellectual society. I and Larry quickly became friends when we were working together.
We were searching day and night on the Internet. We were finding a lot of information but with the feeling we still couldn’t find enough of what we were looking for . Naturally the idea for a search engine that would allow specific information to be found in the endless pool of data was born like it came to us. It wasn’t our plans but we gave up the education at the university. You know the next part ,maybe—we managed to turn an ordinary garage in Peplo Park, California , the USA into our first office, in which Google was born. With excitement we typed the name of the thing which we created with love on September 14th,1998—www.Google.com. Now after those years we bought this garage. As a symbol it will always remind us that everything is possible.
Which of the following would be the best title for this passage?

A.The Birth of Google B.The Founder of Google
C.The Importance of Cooperation D.The Great Contribution to the Internet

From the passage we know that Larry Page________.

A.was born from a rich merchant family
B.was once a student in the Stanford University
C.published some academic articles when young
D.was Brin’s important partner in starting Google

Why did they found Google ?

A.Because they loved working with the Internet so much.
B.Because they wanted to make a lot of money through the Internet
C.Because they hoped to make it easy to find specific information online
D.Because they believed everything is possible.

Which is the right order of what happened ?
a. My family moved from Russia to the USA
b. I met Larry Page
c. I was given a computer as a present on my 9th birthday.
d. google was born in an ordinary garage in California.
e. I graduated from the university in Mathematics and IT.

A.a-c-e-b-d B.c-a-b-e-d C.a-c-b-d-e D.c-b-a-e-d

Dear Alice,
You really have two different questions here, so we’ll discuss them one at a time. Your problems at school may be a result of a number of things . You don’t say much about how these classmates get along with each other. It’s possible that all the students are feeling a little cautious(谨慎的) in the first term.
It’s also possible that the others are unkind. If this is so, you have to find out why you are the class “outsider”.
In your letter you say you often offer to help others with their work. Is it possible that your classmates don’t understand your offers? Could it seem that you were trying to “ buy” friends with these offers?
Is it possible that you took no notice of your classmates when you had your good friends near you ? They may have felt hurt at that time. It may take a time for them to believe in you if so. Try to ask one classmate directly what the problem is. If you hear a negative answer, at least you’ll know what to do.
Yours truly,
Shelia
From the letter we know that Alice was very _______.

A.lucky B.unkind C.clever D.unhappy

From the letter, we can conclude that ______.

A.Alice wasn’t pleased with her teachers .
B.Alice’s parents made her study too hard.
C.Alice didn’t get along well with her classmates
D.Alice didn’t want to go to school any more

Which of the following is NOT true according to the letter?

A.Alice felt her classmates weren’t kind to her.
B.Alice was very warm-hearted to help her classmates
C.Alice didn’t want to get along well with her classmates.
D.Alice asked two questions in her letter

It was 1504,and Columbus was making another trip to the New World. Columbus and his men needed fresh water and food after three months at sea. They saw an island and went on shore. On the island there were unfriendly Indians who refused to give food to them. Columbus’ men were afraid of the Indians, but he had a clever plan. He used sign language to tell the Indians about his mysterious (神秘的) power to turn off the light in the sky. He knew about a lunar eclipse (月蚀) the next night because the information was in his almanac (天文历书). Columbus told the Indians, “ Tomorrow night I’ll turn off the light in the sky.” But they didn’t believe him . When the eclipse began the next night ,the Indians became very frightened . They begged Columbus to turn on the light again , and they quickly gave him all the food and water he wanted. Immediately Columbus and his men hurried back to the ship and sailed away in the moonless night.
Columbus and his men stopped at the island because_______________.

A.they wanted to meet the Indians there
B.they hoped to get supplies of food and water
C.they had never been on the island before
D.they had planned to visit it

The Indians ___________ Columbus and his men.

A.were glad to see B.were kind to
C.welcomed D.were not kind to

Columbus ________ to tell the Indians that he had mysterious power.

A.used movements of hands and expressions in his face
B.spoke in the language of the Indians
C.drew a lot of signs
D.wrote in the language of the Indians

“The light in the sky ” here means __________.

A.the sun B.the moon C.the stars D.the daylight

The Indians gave Columbus food and water because they _________.

A.believed Columbus was a man with mysterious power
B.were interested in Columbus’ trip
C.wanted to help Columbus
D.were clever

Henry found work in a bookstore after he finished middle school. He wouldn’t do anything but wanted to get rich. Mr King thought he was too lazy and was going to send him away. Henry was afraid and had to work hard.
It was a cold morning. It was snowing and there was thin ice on the streets. Few people went to buy the books and the young man had nothing to do. He hated to read, so he watched the traffic. Suddenly he saw a bag fall off a truck and it landed by the other side of the street.
“It must be full of expensive things, ”Henry said to himself. “I have to get it, or others will take it away. ”
He went out of the shop and ran across the street. A driver saw him and began to whistle(鸣笛), but he didn’t hear it and went on running. The man drove aside, hit a big tree and was hurt in the accident. Two weeks later Henry was taken to court(法庭). A judge asked if he heard the whistle when he was running across the street. He said that something was wrong with his ears and he could hear nothing.
“But you’ve heard me this time.”said the judge.
“Oh, I’m sorry. Now I can hear with one ear.”
“Cover the ear with your hand and listen to me with your deaf(聋的)one. Well, can you hear me? ”
“No, I can’t. sir. ”
What was Mr. King?

A.a driver B.a doctor C.a policeman D.a shopkeeper

Why did Mr. King want to send Henry away?

A.Because Henry was too lazy.
B.Because Henry hoped to be rich.
C.Because Henry finished middle school.
D.Because Henry sold few books.

The driver was afraid to _______, so he drove aside.

A.hit Henry B.hurt himself C.fall behind D.lose the bag

What does the underlined word“judge”mean in Chinese?

A.裁判 B.律师 C.法官 D.原告

Why did Henry say that he was deaf?

A.He wanted to have a joke with the judge.
B.He wanted to get the judge’s help
C.He wanted to find another piece of work
D.He didn’t want to pay for the accident.

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