题目
题型:不详难度:来源:
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
答案
解析
66.B细节理解题。由文章第一段可知大量二氧化碳集中在一起,会使地球表面的温度升高。因为二氧化碳的作用就象单向的镜子或者温室的玻璃屋顶一样只允许阳光进来,而里面的热却无法散去。
67.C主旨大意题。文章第一至第四段解释二氧化碳对全球气候的影响,而第五、六段又怀疑二氧化碳的作用,分析太阳活动对全球变暖的影响。由此看来,文章的目的是解释影响天气的原因。
68.B细节理解题。文章第五段提出北半球消耗燃料多,排放的二氧化碳量大,按道理北半球气候应升高但实际反而下降,什么原因?第六段从太阳活动解释了上述疑问:可能部分是由于太阳能量释放的不同。
69.A细节理解题。由最后一段第二句”The problem is that the models are predicting that the world should be entering a new Ice Age and it is not”可以推测科学家认为地球气候应变冷,而入新的冰河时期。
70.B推理判断题。如果新的冰河时期推迟的假设正确,可能是因为地球表层的二氧化碳起的保温作用。
核心考点
试题【In the atmosphere, carbon dioxide acts rather like a one-way mirror or the glass】;主要考察你对题材分类等知识点的理解。[详细]
举一反三
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
Text messages have exploded in popularity in recent years, particularly among young people. The wireless industry’s trade association, CTIA, estimates (估计) more than 48 billions text messages are sent each month.
The plan comes from the Warning Alter and Response Network Act, a 2006 federal law that requires improvement to the nation’s emergency alter system. The act tasked the Federal Communications Commission (FCC) with coming up with new ways to alter the public about emergencies.
“The ability to deliver accurate and timely warning and alters through cell phone and other mobile services is an important next step in our efforts to help ensure that the American public has the information they need to take action to protect themselves and their families before, and during, disasters and other emergencies,” FCC Chairman Kevin Martin said following approval of the plan.
Participation in the alter system by carriers — telecommunication companies — is voluntary, but it has received solid support from the wireless industry.
The program would be optional for cell phone users. They also may not be charged for receiving alters.
There would be three types of messages, according to the rules.
The first would be a national alter from the president, likely involving a terrorists attack or natural disaster. The second would involve “approaching threats,” which could include natural disasters like hurricanes or storms or even university shootings. The third would be reserved for child abduction (绑架)emergencies, or so-called Amber Alerts.
The service could be in place by 2010.
61. What is the purpose of the approval plan?
A. To warn people of emergencies via message.
B. To popularize the use of cell phone.
C. To estimate the monthly number of messages.
D. To promote the wireless industry.
62. The improvement to the present system is in the charge of ______.
A. CTLA. B. the Warning Alert and Response Network
C. FCC D. federal regulators
63. The carriers’ participation in the system is determined by _______.
A. the US federal government B. mobile phone users
C. the carriers themselves D. the law of the United States
64. Which of the following is true of cell phone users?
They must accept the alert service.
B. They may enjoy the alert service for free.
C. They must send the alerts to others.
D. They may choose the types of messages.
65. An alert message will NOT be sent if __________.
A. a child loses his way B. a university shooting happens
C. a natural disaster happens D, a terrorist attack occurs
66. Which of the following would be the best title for the test?
A. Cell Phone Alerts Protecting Students
B. Cell Phone Alerts by Wireless Industry
C. Cell Phone Alerts Natural Disasters
D. Cell Phone Alerts Coming Soon
The Brisbane City Council(BCC)is responsible for bus and ferry services with in the city limits and suburbs.Most buses will either arrive at the city or an interchange where connecting buses can be caught.BCC buses operate from 5:30 am to 11:00 pm Monday to Thursday and 5:30 am t0 12:00 am on Fridays .On weekends and public holidays buses operate less frequently Pre—paid bus tickets can be purchased from the QUT (Queensland University of Technology)bookshop,the campus newsagency.most other newsagencies and general stores,and any BCC Customer Service Centre.Short-term students at QUT cannot use their ID cards to gain a discount fare on BCC public transport.You will need to buy an adult ticket to travel.Bus fares are dependent on the number of zones you have to travel.There are several types of tickets:
Single:one way ticket to reach your destination,including transfers within 2 hours.
Daily: unlimited travel within the zones.
Off-peak’ Daily:discounted unlimited travel between 9:00 am and 3:30 pm and after 7:00 pm
Monday to Friday, and all day on weekends and public holidays.
Weekly:unlimited travel within the zones for one week from the date of issue.
Monthly:unlimited travel within the zones for one calendar month from the date of issue.
Ten-trip Saver: 10 trips at any time within the zones on buses and ferries only.
Transport routes.timetables and fare information are available from:
Public Transport Information Centre
69 Ann Street (corner of George St)
Brisbane City
Phone l3 12 30(Transport Information Service)
64.The transport guide above is most likely provided by .
A.Public Transport Information Centre
B.the Brisbane City Council
C.Queensland University of Technology.
D.BCC Customer Service Centres
65.We can learn from the passage that .
A.buses are scheduled as usual on weekends and public holidays
B.regular students at QUT need to buy adult tickets
C.Pre—paid tickets can be bought from the Public Transport Information Centre
D.Ten-trip Savers can be used at off-peak time
66.An exchange student staying at QUT for five days has to travel between zones every day.What type of ticket would he probably buy?
A.Single. B.Weekly. C.Off-peak Daily. D.Ten—trip Saver.
Several yards away,Frank,43,and his girlfriend,Jennifer,found a spot close to where the front of the train would stop. They were deep in discussion about a house they were thinking of buying.
But when he heard the scream,followed by someone yelling,“Oh,my God,she fell in!” Frank didn’t hesitate. He jumped down to the tracks and ran some 40 feet toward the body lying on the rails. “No! Not you! ”his girlfriend screamed after him.
She was right to be alarmed. By the time Frank reached Lisa,he could feel the tracks shaking and see the light coming. The train was about 20 seconds from the station.
It was hard to lift her. She was just out. But he managed to raise her the four feet to the platform so that bystanders could hold her by the grins and drag her away from the edge. That was where Lisa briefly regained consciousness,felt herself being pulled along the ground,and saw someone else holding her purse.
Lisa thought she’d been robbed. A woman held her hand and a man gave his shirt to help stop the blood pouring from her head. And she tried to talk but she couldn’t,and that was when she realized how much pain she was in.
Police and fire officials soon arrived,and Frank told the story to an officer. Jennifer said her boyfriend was calm on their 40-minute train ride downtown—just as he had been seconds after the rescue,which made her think about her reaction at the time. “I saw the train coming and 1 was thinking he was going to die,”she explained.
41. What was the most probable cause for Lisa’s weakness?
A. She had run a long way.
B. She felt hot in the subway.
C. She had done a 1ot of work.
D. She had donated blood the night before.
42. Why did Jennifer try to stop her boyfriend?
A. Because they would miss their train.
B. Because he didn’t see the train coming.
C. Because she was sure Lisa was hard to lift.
D. Because she was afraid the train would kill him.
43. How did Frank save Lisa?
A. By lifting her to the platform.
B. By helping her rise to her feet.
C. By pulling her along the ground.
D. By dragging her away from the edge.
44. When did Lisa become conscious again?
A. When the train was leaving.
B. After she was back on the platform.
C. After the police and fire officials came.
D. When a man was cleaning the blood from her head.
45. The passage is intended to _____________
A. warn us of the danger in the subway
B. show US how to save people in the subway
C. tell US about a subway rescue
D. report a traffic accident
Components of Soft
Soil is made up of a number of layers(层),each having its own distinctive colour and texture.The upper layer is known as the litter.It acts like a blanket.limiting temperature changes and reducing water loss.The topsoil layer is made up of small particles of rock mixed with rotten plant and animal matter called humus(腐殖质),which is black and gives the topsoil its dark colour.This layer is usually rich in nutrients,oxygen,and water.Below the topsoil is the subsoil,a layer that contains more stones mixed with only small amounts of organic matter.This layer is lighter in colour because of the lack of humus.Beneath the soil lies a layer of bedrock.
Soil forms from the bottom up.Over time bedrock is attacked by rain, wind,frost, and snow.It is gradually broken down into smaller particles in a process called weathering.Plants begin to grow,and rotten materials enrich the topsoil.Most of the soil in Eastern Canada.for example.Was formed from weathered rock that was exposed when the ice disappeared l2.000 years ag0.
Water Beneath the Soil
Surface water collects and flows above the ground in lakes.ponds.and rivers.Once in the soil or rock,it is called groundwater.Gravity pulls groundwater through the soil in a process called percolation(渗透).Eventually the water reaches a layer called the water table.Under this is bedrock through which water cannot percolate.
As water percolates downward,it dissolves organic matter and minerals from the soil and carries them to deeper layers.This causes a serious problem because plants require these nutrients for growth.
Soil pH
Soil can be acidic.neutral.or basic.The pH of the soil is determined by the nature of the rock
from which it was formed.and by the nature of t}le plants that grow and rot in it.
The acidity of rain and snow can lower the pH of the groundwater that enters the soil.By burning fossil fuels such as coal,oil and gasoline,humans have been contributing to higher levels of acidity in many soils.When fossil fuels are burned.gases are released into the air and then fall back to earth as acid rain.Acid soil increases出e problem of carrying nutrients to lower soil levels.As nutrients are removed,soil is less fertile.Plants grow more slowly in acidic soil,and also become easily attacked by diseases.
小题1:The layer of soil that provides necessary nutrients for plant growth is called.
A.1itter | B.topsoil | C.humus | D.subsoil |
A.Soil forms from weathered rock on the earth surface. |
B.The deeper layer of soil is darker in colour than t}le surface soil. |
C.Air pollution is partially responsible for acid soil. |
D.Groundwater tends to carry away nutrients for plant growth. |
A.between the topsoil layer and the subsoil layer |
B.in the subsoil layer above bedrock |
C.between the subsoil layer and bedrock |
D.in the bedrock layer beneath the subsoil |
A.rushed away into the river |
B.cleaned and purified by water |
C.destroyed and carried away by water |
D.mixed with water and become part of it |
最新试题
- 1Does ______ matter if he can’t finish the job on time?A.this
- 2如图,A、B、C三点在正方形网格线的交点处.若将△ACB绕着点A逆时针旋转得到△AC′B′,则tan B′的值为(
- 32010年上海世博会的门票定价:平日普通票价格为160元人民币,优惠票价格为100元人民币、夜间票价格为90元人民币等不
- 4在购买标有“OTC”标识的药品时,药品说明书中的哪项信息不是至关重要的( )A.生产日期和有效期B.适应症和禁忌症C.
- 5某公司一年购买某种货物600吨,每次都购买x吨(x为600的约数),运费为3万元/次,一年的总存储费用为2x万元.若要使
- 6写出(1)(2)化学符号的含义,并按要求完成(3)(4)。(1)2N________________;(2)CO32-_
- 7有人用铁丝固定在两棵树干上晒衣服,这种做法有什么害处?
- 8 What ________ it will be when we all go on holiday together
- 9下图是我国四个城市下半年日出日落时间(北京时间)变化图,读图完成1—2题。1、4月15日这一天,最先看到日出的是[
- 10 for the free tickets, I would not have gone to the
热门考点
- 1在探究海波和石蜡熔化规律时,小强记录的实验数据如下表所示。请根据表中的实验数据解答下列问题。 (1)在海波和石蜡这两种物
- 2The murderer was brought in, with his hands behind h
- 3(1)已知a= 3 cm,b= 60 mm,c= 4 cm,试求a、b、c的第四比例项d;(2)已知a=4cm,c= 9
- 4在▱ABCD中,(1)若∠A+∠C=80°,∠D=______°;(2)若周长为40cm,AB:AD=2:3,则AB=_
- 5同温同压下有两份质量相同的O2和O3两种气体,关于它们的叙述不正确的是( )A.氧元素的质量比是1:1B.氧原子个数比
- 6声音在下列物质中传播最快的是A.钢轨 B.湖水C.煤油 D.空气
- 7用二胡、吉它、笛子三种乐器演奏同一首曲子,我们在隔壁房间仍能分辨出是哪种乐器演奏的,这主要是依据声音的( )A.音调
- 8骨骼肌包括中间较粗的_______和两端较细的_______。
- 92010年,我国开展了第六次全国人口普查,这对于我们把握国情国力、制定政策和规划具有重要意义。而据我国首部《国家人口发展
- 10如果直线与直线平行,那么系数等于( )A.B.C.D.