A rainforest is an area covered by tall trees with the total high rainfall sprea

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A rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely dipping below l6℃．Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate．Without the forest cover，these areas would reflect more heat into the atmosphere，warming the rest of the world. Losing the rainforests may also influence wind and rainfall patterns，potentially causing certain natural disasters all over the world．
In the past hundred years，humans have begun destroying rainforests in search of three major resources(资源): land for crops，wood for paper and other products，land for raising farm animals．This action affects the environment as a whole．For example，a lot of carbon dioxide(二氧化碳) in the air comes from burning the rainforests．People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.
There are two main reasons for this．Firstly，when people cut down trees，generally they can only use the land for a year or two．Secondly，cutting large sections of rainforests may provide a good supply of wood right now，but in the long run it actually reduces the world’s wood supply．
Rainforests are often called the world’s drug store．More than 25％ of the medicines we use today come from plants in rainforests．However，fewer than l％of rainforest plants have been examined for their medical value．It is extremely likely that our best chance to cure diseases lies somewhere in the world’s shrinking rainforests．
小题1:Rainforests can help to adjust the climate because they ．

A．reflect more heat into the atmosphere

B．bring about high rainfall throughout the world

C．rarely cause the temperature to drop lower than l6℃

D．reduce the effect of heat from the sun on the earth

小题2:What does the word “this” underlined in the third paragraph refer to?

A．We will lose much more than we can gain．

B．Humans have begun destroying rainforests．

C．People have a strong desire for resources．

D．Much carbon dioxide comes from burning rainforests．

小题3:It can be inferred from the text that .

A．we can get enough resources without rainforests

B．there is great medicine potential in rainforests

C．we will grow fewer kinds of crops in the gained land

D．the level of annual rainfall affects wind patterns

小题4:What might be the best title for the text?

A．How to Save Rainforests	B．How to Protect Nature
C．Rainforests and the Environment	D．Rainforests and Medical Development

答案

小题1:D
小题2:A
小题3:B
小题4:C

解析

小题1:因果判断题。由文章第一段内容可以得出答案。
小题2:由上下文内容可知，A项是正确的。
小题3:推测判断题。由文章最后一段内容即可得出答案。
小题4:主旨大意题。整篇文章主要论述了热带雨林的重要作用以及砍热带雨林对环境所造成的影响。

举一反三

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56.. How many reasons for going to college does the author mention in the text?
A. 2        B. 3        C. 4       D. 5
57. The author thinks you should choose the college that is          .
A. well-equipped      B. competitive   C. suitable D. famous
58. What does the author advise you to do to pay the high cost of college ?
A. To ask the family for help.           B. To make a study of financial courses.
C. To do research on the price of college D. To get to know how to ask for financial aid.
59. What’s the author’s purpose of writing this text.?
A. To suggest ways to prepare for college learning. B. To help readers find the right college.
C.To make Johnson Review popular.
D. To introduce college life.
60. Where may the article be taken from?
A. A Journalist Book   B. A Travel Book C. A Grammar Book   D. An Advice Book

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In the atmosphere, carbon dioxide acts rather like a one-way mirror or the glass in the roof of a greenhouse which allows the sun"s rays to enter but prevents the heat from escaping.
　　 According to a weather expert" s prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metres and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere (北半球), possibly resulting in an alteration of the earth"s chief food growing zones.
　　 In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming, in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.
　　 Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.
　　 However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. Scientists conclude , therefore, that up to now natural influences on the weather have gone beyond those caused by man. The question is: Which natural cause has most effect on the weather?
　　 One possibility is the variable behavior of the sun. Astronomers at one research station have studied the hot spots and "cold" spots (that is, the relatively less hot spots) on the sun. As the sun rotates (使旋转), every 27. 5 days, it presents hotter or "colder" faces to the earth, and different aspects to different parts of the earth. This seems to have a considerable effect on the distribution of the earth"s atmospheric pressure, and consequently on wind circulation. The sun is also changeable over a long term: its heat output goes up and down in cycles, the latest trend being downward.
　　 Scientists are now finding shared relations between models of solar weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering a new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia (惯性) of the earth"s climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful opposed balance to the sun"s fading heat .
66. It can be concluded that a concentration of carbon dioxide in the atmosphere would_________.
A. mean a warming-up in the Antarctic
B. raise the temperature of the earth" s surface
C. prevent the sun"s rays from reaching the earth"s surface
D. explain the cause of great changes in the climate in the northern hemisphere
67.The article was written to explain ___________.

A. the greenhouse effect
B. the solar effects on the earth
C. the causes affecting weather
D. the models of solar-weather interactions
68. Although the fuel consumption is greater in the northern hemisphere, temperatures there　seem to be falling. This is__________.
A. mainly because the levels of carbon dioxide are rising
B. partly due to changes in the output of solar energy
C. possibly because the ice caps in the poles are melting
D. only due to the effect of the inertia of the earth" s climate
69. On the basis of their models, scientists believe the opinion that__________.
A. the climate of the world should be becoming cooler
B. the new Ice Age will be delayed by the greenhouse effect
C. the man-made warming effect helps to increase the solar effects
D. it will take thousands of years for the inertia of the earth"s climate to take effect
70. If the assumption about the delay of a new Ice age is correct, ____________.
A. ice would soon cover the northern hemisphere
B. the greenhouse effect could work in favor of the earth
C. the best way to overcome the cooling effect would be to burn more fuels
D. the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly

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Did you know that women’s brains are smaller than men’s? The average women’s brain weighs 10% less than men’s．Since research has shown that the bigger the brain, the cleverer the animal, men must be more intelligent（聪明的） than women．Right? Wrong．Men and women always score similarly on intelligence tests, despite the difference in brain size．Why? After years of study, researchers have concluded that it’s what’s inside that matters, not just the size of the brain．The brain consists of “grey matter” and “white matter”．While men have more of the latter, the amount of “thinking” brain is almost exactly the same in both sexes．
It has been suggested that smaller brain appears to work faster, perhaps because the two sides of the brain are better connected in women．This means that little girls tend to learn to speak earlier, and that women can understand sorts of information from different sources at the same time．When it comes to talking to the boss on the phone, cooking dinner and keeping an eye on the baby all at the same time, it’s women who come out on top every time．
There are other important differences between two sexes．As white matter is the key to spatial（空间的） tasks, men know better where things are in relation to other things．“A great footballer always knows where he is in relation to the other players, and he knows where to go,” says one researcher．That may explain one of life’s great mysteries: why men refuse to ask for directions…and women often need to!
The differences begin when fetuses（胎儿） are about nine weeks old, which can be seen in the action of children as young as one．A boy would try to climb a barrier （障碍物） before him or push it down while a girl would attract help from others．These brain differences also explain the fact that more men take up jobs that require good spatial skills, while more women speech skills．It may all go back to our ancestors（祖先）, among whom women needed speech skills to take care of their babies and men needed spatial skills to hunt, according to one research．
If all this disappoints you, it shouldn’t．“The brain changes throughout our lives according to what we do with it．” says a biologist．
56．The passage mainly tells us ________．
A．the difference between men’s and women’s brains
B．the changes in brain throughout our lives
C．that men are better at spatial tasks
D．that brain differences are related to our ancestors
57．Which of the following is true according to the first paragraph?
A．Women’s brain is 10% less than men’s
B．Grey matter plays the same role as white matter．
C．Grey matter controls thinking in the brain．
D．Both sexes have the same amount of white matter．
58．What can we infer from the second and third paragraphs?
A．Women prefer doing many things at a time．
B．Men do better dealing with one job at a time．
C．Women do not need to tell directions．
D．Men have weaker spatial abilities．
59．Which of the following do you agree with according to the fourth paragraph?
A．Young boys may be stronger than young girls．
B．More women take up jobs requiring speech skills
C．Women may have stronger feelings than men．
D．Our ancestors needed more spatial skills．
60．What is the writer’s attitude in writing this passage?
A．Defensive．        B．Persuasive． C．Supportive．        D．Objective．

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Melissa Poe was 9 years old when she began a campaign for a cleaner environment by writing a letter to the then President Bush. Through her on efforts, her letter was reproduced on over 250 donated billboards (广告牌)across the country.
The response to her request for help was so huge that Poe established Kids For A Cleaner Environment (Kids F.A.C.E.) in 1989. There are now 300,000 members of Kids F.A.C.E. worldwide and it is the world’s largest youth environmental organization.
Poe has also asked the National Park Service to carry out a “Children’s Forest” project in every national park. In 1992, she was invited one of only six children in the world to speak at the Earth Summit in Brazil as part of the Voices of the future Program. In 1993, she was given a Caring Award for her efforts by the Caring Institute.
Since the organization started, Kids F.A.C.E. members have distributed and planted over 1 million trees! Ongoing tree-planting projects include Kids’ Yards — the creation of backyard wildlife habitats (栖息地) and now Kids F.A.C.E. is involved in the exciting Odyssey, which is a great way to start helping.
“We try to tell kids that it’s not OK to be lazy,” she explains, “You need to start being a response, environmentally friendly person now, right now, before you become a resource-sucking adult.”
72. Kids F.A.C.E. is __________.
A. a program to help students with writing
B. a project of litter recycling
C. a campaign launched by President Bush
D. a club of environmental protection
73. What can we learn about Poe?
A. She was awarded a prize in Brazil.
B. She donated billboards across the country.
C. She got positive responses for her efforts.
D. She joined the National Park Service.
74. Kid’s Yards is ____________.
A. established in national park
B. started to protect wildlife
C. a wildlife-raising project
D. an environment park for kids
75. Which of the following can be inferred from the text?
A. Adults are resources –sucking people.
B. Poe sought help from a youth organization
C. Kids F.A.C.E. members are from the U.S.
D. Kids are urged to save natural resources.

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It’s not easy being a teenager（13至19岁青少年）—nor is it easy being the parent of a teenager. You can make your child feel angry, hurt, or misunderstood by what you say without realizing it yourself. It is important to give your child the space he needs to grow while gently letting him know that you you’ll still be there for him when he needs you.
Expect a lot from your child, just not everything. Except for health and safety problems, such as drug use or careless driving; consider everything else open to discussion. If your child is unwilling to discuss something, don’t insist he tell you what’s on his mind. The more you insist, the more likely that he’ll clam up. Instead , let him attempt to solve（解决）things by himself. At the same time, remind him that you’re always there for him should he seek advice or help. Show respect for your teenager’s privacy （隐私）. Never read him his mail or listen in on personal conversions.
Teach your teenager that the family phone is for the whole family. If your child talks on the family’s telephone for too long, tell him he can talk for15 minutes, but then he must stay off the phone for at least an equal period of time. This not only frees up the line so that other family members can make and receive calls, but teaches your teenager moderation（节制）. Or if you are open to the idea, allow your teenager his own phone that he pays for with his own pocket money or a part –time job
68. The main purpose of the text is to tell parents _____________.
A. how to get along with a teenager
B. how to respect a teenager
C. how to understand a teenager
D. how to help a teenager grow up
69. What does the phrase “clam up” in Paragraph 2 probably mean?
A. become excited B. show respect
C. refuse to talk D. seek help
70. What should parents do in raising a teenager according to the text?
A. Nor allow him to learn driving or take drugs
B. Give him advice only when necessary
C. Let him have his own telephone
D. Not talk about personal things with him

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