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In the atmosphere,carbon dioxide actd 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 excaping.
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 luels 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 meters and severely flooding coastal cities.Also，the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere(半球),psooicbly resulting in an alteration of 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 a warming on the scale that will possibly take place in the next fifty years from on burning of fuels.
Satellite pictures showthat 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 exceeded 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(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 variable over a long term:its heat output goes up and down in cycles,the latest trend being downward.
Scientists are now finding mutual 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(不活动，惰性) of the earth's climate.If this is right,the warming effect of carbon dioxide might thus be serving as a useful counter balance to the sun's diminishing heat.
68.It can be concluded that a concentration of carbon dioxide in the atmosphere would ___.
A.mean a warming - up im the Arctic
B.raise the temperature of the earth's surface
C.prevent the sun's rays from reaching the earth's surface
D.account for great changes in the climate in the northern hemiphere
69.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 variations in the output of solar energy
C.possibly because the ice caps in the poles are melting
D.exclusively due to the effect of the inertia of the earth's climate
70.On the basis of their models,scientists are of 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
My husband is an engineer. Since we met，he has always been the rock in my life.I knew he had his feet __36__ planted on the ground，and it seemed that no matter what else went __37__，he would be the constant one.
Three years of romance and two years of marriage later, I began to feel __38__ of him because he never brought me flowers，he never __39__ me，and nothing had changed in our marriage.
After __40__， I finally told him I wanted to be __41__. He just sat there, speechless and didn't even know __42__ to say to make me stay. Finally，he spoke, “What can I do to change your __43__？”
“I'll stay if you have a good answer __44__ this question，”I replied coldly. “If I asked for a __45__ growing on a cliff, and getting it for me __46__ certain death，would you still do so？”
His face grew troubled. “Can I give you the answer tomorrow morning？” With that, my heart __47__. He couldn't even give me an answer __48__ away.
The next morning，I found he was __49__. However，I found a note under a warm glass of milk. My eyes __50__ misty(湿润)as I was reading it.
“Dear，I'll give you my __51__.
After you do typing for a long time, I need my __52__ to do it for you.
Every time you leave the house，you forget your keys. I need my legs to run __53__ and open the door for you.... that's why I cannot pick the flower for you...”
With tears __54__ from my eyes, I opened the door. And there he was, with an extremely worried look on his face, waving the packet he had in his hand in front of me.
Just because someone doesn't love you __55__ you want him to, it doesn't mean that he doesn't love you heart and soul.
36．A.deeply B．firmly C．slightly D．totally
37．A.different B．crazy C．exciting D．excited
38．A.liked B．tried C．fond D．tired
39．A.frightened B．loved C．surprised D．lost
40．A.some time B．sometime C．sometimes D．some times
41．A.in B．up C．down D．out
42．A.what B．which C．how D．when
43．A.saying B．comment C．opinion D．mind
44．A.to B．of C．for D．about
45．A.tree B．moon C．flower D．butterfly
46．A.meant B．resulted C．caused D．led
47．A.sank B．settled C．rose D．worried
48．A.soon B．straight C．slight D．quickly
49．A.missed B．missing C．losing D．lost
50．A.fell B．changed C．grew D．got
51．A.descriptions B．causes C．lists D．reasons
52．A.heart B．fingers C．mind D．arms
53．A.home B．at home C．out D．in
54．A.steaming B．stretching C．streaming D．spreading
55．A.like it B．way C．how D．the way
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What an exciting day it was for Jennifer and Valerie! They 26 friends since Grade Three and had 27 many of their high school experiences. Now they were driving together to their final high school event. Today was 28 day at Laman High School. 29 they were close friends, they were different in many ways. Jennifer was a fairly 30 student while Valerie did just enough to get by and was mainly 31 in a good social life.
"Isn't it 32 that we're all finished?" said Valerie. "I'm really looking forward to having a 33 time this summer."
" 34 be nice," Jennifer replied. "I'm afraid I'm going to have to work most of the summer to help pay for my college expenses. "
Jennifer's parents had only a small 35 and she had made up her mind to have a career in which he could 36 all the things her 37 could not.
Valerie, 38 , came firm a fairly wealthy family. She had little desire to work hard for 39 she had always taken for granted.
"I really don't want to go to college for a while," she 40 . "My uncle 41 a restaurant in the Bahamas and he has 42 me to spend a year there 43 a waitress. That should give me plenty of 44 for the beach. "
"It seems 45 will really be going different ways now," thought Jennifer.
1.A.has been B. were C. had been D. would be
2.A.learned B. obtained C. remembered D. shared
3.A.exam B. sports C. graduatioD. working
4.A.If B. Because C. Although D. When
5.A.diligent B. polite C. active D. favorite
6.A.specialized B. relievedC. envied D. interested
7.A.certain B. great C. unfortunate D. annoying
8.A.nice B. high C. bad D. happy
9.A.Can B. Shall C. Must D. Need
10.A.income B. problem C. family D. difference
11.A .afford B. give C. support D. send
12.A .teachers B. parents C. friends D. relatives
13.A.in fact B. in a way C. as a result D.on the contrary
14.A.what B. whom C. that D. these
15.A.admitted B. complain C. proposed D. screamed
16.A.opens B. runs C. works D. makes
17.A.helped B. assured C. invited D. promised
18.A.on B. do C. like D. as
19.A.peace B. work C. energy D. time
20.A.I B. we C. she D. they
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Russia's withdrawal of its experts from China did not strangle (压垮) the Chinese people; _____ it stirred up their enthusiasm for greater exertions.
A. on the other hand B. on the contrary
C. to the contrary D. in consequence
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[1] Imagine walking up to a world where China is the world's leading superpower, astronauts are busy walking on Mars and a brand new political party is ruling the UK? Well, this could be the reality in 13 years if some of the predictions of 100, 000 Britons are correct．
[2] The survey asked the people of the UK how they pictured the world in 2025．
[3] Nearly half believe Prince William will be crowned King of England instead of Prince Charles although one in six think the monarchy(君主制度)will have been abolished．A quarter of those surveyed believe a new party will form the government in 2025, although the same number of people think that Labour will be back in power．
[4] On the world stage 60 per cent think China is set to become the world's leading superpower, while a third think Great Britain will be made up of four self-governed countries．
[5] Meanwhile technology will have come on in leaps and bounds．Four percent are optimistic that there will be a permanent human base on Mars while one in ten expect a colony of humans to be living in space．More than half questioned in the MSN study predict people will watch all their favorite shows via TV sets hooked up to the Internet．Two-thirds believe cosmetic surgery(整容手术)will have become common and one in six think we will look after our own health using computers rather than ________．
[6] But at least we can amuse ourselves with the daily comings and goings of pop singers and reality stars, as more than half think that "celebrity"(明星)will be a registered profession．
1．What is the main idea of the text?(no more than 10 words)
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2．Which sentence in the text is closest in meaning to the following one?
The British people were questioned about their predictions of the world in 13 years．
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3．Fill in the blank in Paragraph 5 with proper words．(no more than 5 words)
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4．Many people think cosmetic surgery will have become common by 2025．What's your opinion? Please give at least two reasons．(no more than 25 words)
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5．Translate the underlined sentence in Paragraph three into Chinese．
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