After the passage of a cold front the visibility ______.A.does not changeB.improves rapidlyC.improves only slightlyD.becomes poor
After the passage of a cold front the visibility ______.
A.does not change
B.improves rapidly
C.improves only slightly
D.becomes poor
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After a period of prosperity (1920 ~ 1929), government involvement in the economy increased _________. A.during the Great DepressionB.after the WW IC.after the WW IID.during the Cold War
Cumulonimbus clouds are most likely to accompany a(n) ______.A.high pressure systemB.cold frontC.warm frontD.occluded front
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A generally circular low pressure area is called a(n)______．A.cycloneB.anticycloneC.cold frontD.occluded front
After a cold front passes the barometric pressure usually ______.A.fluctuatesB.remains the sameC.remains the same, with clouds forming rapidlyD.rises, often quite rapidly, with clearing skies
After a cold front passes，the barometric pressure______．A.drops，and the temperature dropsB.drops ， and the temperature risesC.rises，and the temperature dropsD.rises，and the temperature rises
An occluded front is caused by a(n) ______.A.low pressure areaB.high pressure areaC.area of calm airD.cold front overtaking a warm front
Brief, violent showers frequently accompanied by thunder and lightning are usually associated with ______.A.passage of a warm frontB.winds shifting counterclockwise in the Northern HemisphereC.stationary high pressure systemsD.passage of a cold front
Cyclones tend to move ______.A.perpendicular to the isobars in their warm sectorsB.parallel to the isobars in their warm sectorsC.parallel to the line of the cold frontD.perpendicular to the line of the cold front
In the Northern Hemisphere, gusty winds shifting clockwise, a rapid drop in temperature, thunderstorms or rain squalls in summer ( frequent rain / snow squalls in winter ) then a rise in pressure followed by clearing skies, indicate the passage of a(n) ______.A.warm frontB.tropical cycloneC.anticycloneD.cold front
After walking hurriedly for half an hour, I wanted to drink （）Asomething coldBcold somethingCsomething with coldDsomething to be cold
After walking hurriedly for half an hour, I wanted to drink （）A、something coldB、cold somethingC、something with coldD、something to be cold
单选题What should you do if you have to work in front of the computer?AEat healthy foods.BClean the eye by using cold water.CWear a pair of sunglasses.DHave a rest after working for a while.
单选题Jim was absent from school for the whole week ______ a bad cold.Abecause ofBin addition toCaccording toDin front of
单选题On a working copy of a weather map，a cold front is represented by what color line? （）ARedBBlueCAlternating red and blueDPurple
单选题Cyclones tend to move（）.Aperpendicular to the isobars in their warm sectorsBparallel to the isobars in their warm sectorsCparallel to the line of the cold frontDperpendicular to the line of the cold front
单选题A cold front moving in from the northwest can produce（）.Athunderstorms，hail，and then rapid clearingBincreasing cloud cover lasting for several daysClengthy wet weatherDlow ceilings with thick cirrus clouds
单选题The height of a tide can be increased by（）.AA storm surgeBA high pressure areaCThe jet streamDA cold front
单选题请阅读 Passage 2，完成第 26~30小题。Passage 2 The common cold is the world's most widespread illness， which is plague that flesh receives.The most widespread fallacy of all is that colds caused by cold.They are not， They are caused by viruses passing on from person to person.You catch a cold by coming into contact， directly or indirectly， with someone who already has one.If cold causes colds， it would be reasonable to expect the Eskimos to suffer from them forever.But they do not.And in isolated arctic regions explorers have reported being free from colds until coming into contact again with infected people from the outside world by way of packages and mail dropped from airplanes.During the First World War soldiers who spent long periods in the trenches， cold and wet，showed no increased tendency to catch colds.In the Second World War prisoners at the notorious Auschwitz concentration camp， naked and starving， were astonished to find that they seldom had colds.At the Common Cold Research Unit in England， volunteers took part in Experiments in which they gave themselves to the discomforts of being cold and wet for long stretches of time.After taking hot baths， they put on bathing suits， allowed themselves to be with cold water， and then stood about dripping wet in drafty room.Some wore wet socks all day while others exercised in the rain until close to exhaustion.Not one of the volunteers came down with a cold unless a cold virus was actually dropped in his nose.If， then， cold and wet have nothing to do with catching colds， why are they more frequent in the winter? Despite the most pains-taking research， no one has yet found the answer， One explanation offered by scientists is that people tend to stay together indoors more in cold weather than at other times， and this makes it easier for cold viruses to be passed on.No one has yet found a cure for the cold.There are drugs and pain suppressors such as aspirin， but all they do is relieve the symptoms.Which of the following does not agree with the passage?AThe Eskimos do not suffer from colds all the time.BColds are not caused by cold.CPeople suffer from colds just because they like to stay indoors.DA person rnay catch a cold by touching someone who already has one.
单选题Cyclones that have warm sectors usually move（）.AwesterlyBparallel to the isobars in the warm sectorCtoward the nearest high pressure areaDfaster than the accompanying cold front
单选题请阅读 Passage 2，完成第 26~30小题。Passage 2 The common cold is the world's most widespread illness， which is plague that flesh receives.The most widespread fallacy of all is that colds caused by cold.They are not， They are caused by viruses passing on from person to person.You catch a cold by coming into contact， directly or indirectly， with someone who already has one.If cold causes colds， it would be reasonable to expect the Eskimos to suffer from them forever.But they do not.And in isolated arctic regions explorers have reported being free from colds until coming into contact again with infected people from the outside world by way of packages and mail dropped from airplanes.During the First World War soldiers who spent long periods in the trenches， cold and wet，showed no increased tendency to catch colds.In the Second World War prisoners at the notorious Auschwitz concentration camp， naked and starving， were astonished to find that they seldom had colds.At the Common Cold Research Unit in England， volunteers took part in Experiments in which they gave themselves to the discomforts of being cold and wet for long stretches of time.After taking hot baths， they put on bathing suits， allowed themselves to be with cold water， and then stood about dripping wet in drafty room.Some wore wet socks all day while others exercised in the rain until close to exhaustion.Not one of the volunteers came down with a cold unless a cold virus was actually dropped in his nose.If， then， cold and wet have nothing to do with catching colds， why are they more frequent in the winter? Despite the most pains-taking research， no one has yet found the answer， One explanation offered by scientists is that people tend to stay together indoors more in cold weather than at other times， and this makes it easier for cold viruses to be passed on.No one has yet found a cure for the cold.There are drugs and pain suppressors such as aspirin， but all they do is relieve the symptoms.The passage mainly discusses ____.Athe experiments on the common coldBthe cures about the common coldCwhy and how people catch coldsDthe continued spread of common colds
单选题After walking hurriedly for half an hour, I wanted to drink （）Asomething coldBcold somethingCsomething with coldDsomething to be cold
单选题Which of the following statements concerning frontal movements is TRUE（）.AThe temperature rises after a cold front passesBThe barometric pressure rises when a warm front passesCA cold front generally passes faster than a warm frontDA warm front usually has more violent weather associated with it than a cold front
单选题After a cold front passes the barometric pressure usually（）.AfluctuatesBremains the sameCremains the same，with clouds forming rapidlyDrises，often quite rapidly，with clearing skies
单选题After the passage of a cold front the visibility（）.Adoes not changeBimproves rapidlyCimproves only slightlyDbecomes poor
单选题After a cold front passes，the barometric pressure（）.Adrops，and the temperature dropsBdrops，and the temperature risesCrises，and the temperature dropsDrises，and the temperature rises
单选题According to the information given in the passage, sulfur dioxide emissions are linked to all except which of the following phenomena?AReduced visibility in the eastern United StatesBDamage to the ozone holeCIncreased rates of asthmaDAcid rainEDamaged forests