Passage one

　　Quesffons 56 to 60 are based on thefollowing passage.

　　Wouldn’t it be great if you could just look up at the sky and read the weather forecast right away?

　　Well，you can.The forecast is written in clouds.If you can read that writing，you can tell something about the atmosphere.With some practice，you can become a pretty good weather forecaster.Who knows，you might even do as well as meteorologists.

　　Meteorologists use much more information than just the appearance of the clouds to make their forecast.They collect data from all over the world.Then they put it into powerful，high—speed computers.This does give the meteorologists an advantage，because they can track weather patterns as they move from west to east across the country.But you have an advantage，too.You can look at the sky and get your data directly.A meteorologist USCS a computer forecast that’s several hours old to make a local forecast.

　　What are you seeing when you look at a cloud?“A picture of moisture is doing in the atmosphere，”says meteorologist Peter Leavitt.There’s moisture throughout the atmosphere.Most of the time you don’t see it，because it’s in the form of an invisible gas called water vapor.Sometimes，the temperature of the air gets cold enough to cause the water vapor to change to liquid water.It’s called condensation，and we see it happen all the time(for example，when humid air from the shower hits the cold glasses of a mirror).When enough water vapor condenses，droplets come in the air.These droplets scatter light.A cloud is seen.

　　Watching clouds over a day or two tells you a lot more than a single cloud about the weather to come.Changes in clouds show changes in the atmosphere.You should begin to notice pattems.Certain clouds，following each other in order,can signal an approaching storm.But don’t take our word for it;see for yourself.

　　56.The word“meteorologists”in the first paragraph means__________.

　　A.people who broadcast weather on TV

　　B.people who are in charge of weather forecast

　　C.experts who study the earth’s atmosphere and its changes

　　D.experts who study the earth’s crust，rocks，strata and the history of its development

　　57.According to the passage，an ordinary person might do as well as meteorologist in weather forecast__________.

　　A.with some simple practice looking up at the sky

　　B.with the help of the high—speed computers

　　C.through a complex instruments

　　D.consulting a weather station

　　58.Meteorologists can make their weather forecast__________.

　　A.by using information of the appearance of the clouds only

　　B.by collecting data from parts of the world

　　C.by calculating and analyzing this data

　　D.by watching the sky

　　59.According to the passage，your advantage in weather forecasts is that__________.

　　A.you have a high-speed computer

　　B.you observe the sky and obtain your data directly

　　C.you have more instruments at home

　　D.you can track weather patterns as they move from west to east across the country

　　60.This passage mainly tells us about how to__________.

　　A. train yourself as a meteorologist

　　B.be an assistant to a meteorologist

　　C. forecast the weather by ourselves

　　D.broadcast the weather forecast

　　Questions 61 to 65 are based on thefollowingpassage.

　　Acid rain，which is a form of air pollution，currently becomes a subject of great debate because of widespread environmental damage for which it has been blamed.It forms when oxides of sulfur(硫) and nitrogen(氮)combine with atmospheric moisture to yield sulfuric and nitric acids，which may then be carried long distances from their source before they drop in the form of rain.The pollution may also take the form of snow or fog or fall down in dry forms.In fact，although the term“acid rain”has been in use for more than a century——it is derived from atmospheric studies that were made in the region of Manchester,England—the more accurate scientific term would be“acid deposition”.The dry form of such deposition is just as damaging to the environment as the liquid form.

　　The problem of acid rain originated with the Industrial Revolution，and it has been growing ever since.The severity of its effects has long been recognized in local settings，as exemplified by the spells of acid smog in heavily industrialized areas.The widespread destructiveness of acid rain，however,has become evident only in recent decades.One large area that has been studied extensively is northernEurope，where acid rain has eroded structures，injured crops and forests，and threatened life in freshwater lakes.In 1984，for example，environmental reports indicated that almost half of the trees in Germany’s Black Forest had been damaged by acid rain.The northeastem United States and eastern Canada have also been Darticularly affected by this form of pollution.Damage has also been detected in other areas of these countries and other regions of the world.

　　Industial emissions have been blamed as the maj or cause of acid rain.Because the chemical reactions involved in the production of acid rain in the atmosphere are complex and as yet little understood.industries have tended to challenge such assessments and to stress the need for further studies and because of the cost of pollution reduction，governments have tended to support this attitude.

　　Studies released by the USA government in the early 1980s，however，strongly indicated industries as the main source of acid rain，in the eastern USA and Canada.

　　61.From the first sentence of the passage，we Iearn that_____.

　　A.acid rain has caused air pollution

　　B.acid rain has caused widespread environmental damage

　　C.acid rain has become a much-studied subject

　　D.acid rain travels in all directions before it rains down

　　62.According to the passage，acid fog_____.

　　A.falls down when the atmosphere is moist

　　B.is not as frequent as acid rain

　　C.often falls in the region of Manchester,England

　　D.is as damaging as acid rain

　　63.The second paragraph is mainly about_____.

　　A.the origin of acid rain

　　B.the cause of acid rain

　　C.the formation of acid rain

　　D.the widespread damage of acid rain

　　64.Why is acid rain liRle understood?

　　A.Because it is a new phenomenon.

　　B.Because it is not frequent enough.

　　C.Because its formation is complex.

　　D.Because it is difficult to study it.

　　65.According to the passage，Governments__________.

　　A.deny that industries causes acid rain

　　B.admit that they are only partly responsible

　　C.claim that they are the main sources of pollution

　　D.think that the cause of acid rain needs further studySection C

　　答案cacbc bddcd