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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 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
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After walking hurriedly for half an hour, I wanted to drink （）Asomething coldBcold somethingCsomething with coldDsomething to be cold
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After walking hurriedly for half an hour, I wanted to drink （）A、something coldB、cold somethingC、something with coldD、something to be cold
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单选题What should you do if you have to work in front of the computer?A
Eat healthy foods.B
Clean the eye by using cold water.C
Wear a pair of sunglasses.D
Have a rest after working for a while.
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单选题Jim was absent from school for the whole week ______ a bad cold.A
because ofB
in addition toC
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单选题On a working copy of a weather map，a cold front is represented by what color line? （）A
RedB
BlueC
Alternating red and blueD
Purple
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单选题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
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单选题A cold front moving in from the northwest can produce（）.A
thunderstorms，hail，and then rapid clearingB
increasing cloud cover lasting for several daysC
lengthy wet weatherD
low ceilings with thick cirrus clouds
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单选题The height of a tide can be increased by（）.A
A storm surgeB
A high pressure areaC
The jet streamD
A cold front
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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?A
The Eskimos do not suffer from colds all the time.B
Colds are not caused by cold.C
People suffer from colds just because they like to stay indoors.D
A person rnay catch a cold by touching someone who already has one.
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单选题Cyclones that have warm sectors usually move（）.A
westerlyB
parallel to the isobars in the warm sectorC
toward the nearest high pressure areaD
faster than the accompanying cold front
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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 ____.A
the experiments on the common coldB
the cures about the common coldC
why and how people catch coldsD
the continued spread of common colds
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单选题After walking hurriedly for half an hour, I wanted to drink （）A
something coldB
cold somethingC
something with coldD
something to be cold
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单选题Which of the following statements concerning frontal movements is TRUE（）.A
The temperature rises after a cold front passesB
The barometric pressure rises when a warm front passesC
A cold front generally passes faster than a warm frontD
A warm front usually has more violent weather associated with it than a cold front
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单选题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
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单选题After the passage of a cold front the visibility（）.A
does not changeB
improves rapidlyC
improves only slightlyD
becomes poor
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单选题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
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单选题According to the information given in the passage, sulfur dioxide emissions are linked to all except which of the following phenomena?A
Reduced visibility in the eastern United StatesB
Damage to the ozone holeC
Increased rates of asthmaD
Acid rainE
Damaged forests
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