Jet lag， caused by traveling between time zones， is becoming a common problem for frequent travelers： for 49 percent it is only a nuisance and for 45 percent it is a real problem. It is caused by disruption（混乱）to the internal biological clock， and may lead to digestive problems， tiredness， and sleep disruption.
Generally speaking， our biological clock is slightly disturbed if we just move into the next time zone， but jet lag becomes a problem once we have passed through three or four time zones. The body takes about one day to get over each hour of time difference. But the seriousness of jet lag problems also depends on our direction of travel. If we go north or south， we won’t notice any difference， because there is usually no time zone change. However if we travel west we will be in advance of ourselves as far as our internal clock is concerned， and problems may arise. A west-to-east journey， on the other hand， makes us late compared to the local time. It often demands even greater effort in adjustment since we are not quick enough to catch up with the new time schedule. Therefore， a trip from New York to Los Angeles often causes fewer problems than a Los Angeles-New York trip.
45. A traveler who suffers from jet lag has problems in ____________.
A. adjusting his biological clock
B. knowing the direction of a jet
C. knowing the distance of his flight
D. getting used to the weather of a new place
46. If one travels across three time zones， he needs about ____________ hours to get over his jet lag problem.
A. 24 B. 36 C. 48 D. 72
47. A person may suffer the most serious case of jet lag when he takes a ____________ journey.
A. east-to-west B. west-to-east C. north-to-south D. south-to-north
48. The main purpose of the passage is to ____________.
A. explain the cause of jet lag problems
B. teach us how to avoid jet lag problems
C. explain the differences between time zones
D. show the ways to lessen the degree of jet lag problems
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冲刺100分单元优化练考卷系列答案科目：高中英语 来源： 题型：阅读理解
A new study says one part of the human brain may become smaller as the result of a condition known as jet lag. Jet lag results from flying long distances in an airplane. People with jet lag may feel extremely tired for several days. They may also have problems thinking clearly and remembering.
Recently a researcher at the University of Bristol in Britain reported the findings of his jet lag study, which involved twenty young women who worked for international airlines. They had served passengers on airplanes for five years. These flight attendants flew across many countries and at least seven time zones. In the study, the flight attendants had different amounts of time to recover from jet lag. Half the women spent five days or fewer in their home areas between long flights The other half spent more than fourteen days in their home areas.
The researcher took some saliva from the women's mouths to measure levels of a hormone(荷尔蒙) that increases during stress (紧张). He tested them to see if they could remember where black spots appeared on a computer screen. And he took pictures of their brains to measure the size of the brain's temporal lobes (脑叶).
It was found that the women who had less time between flights had smaller right temporal lobes. This area of the brain deals with recognizing and remembering what is seen. The same group performed worse and had slower reaction times on the visual memory test. And their saliva samples showed higher levels of stress hormones.
The researcher believes the brain needs at least ten days to recover after a long trip. He says airline workers told him their ability to remember got worse after working on planes for about four years. Other studies have shown that increased feelings of stress can cause a loss of cells in the part of the brain that controls memory.
Scientists say more tests are needed to study the effects of jet lag on the brain. They want to find out if too much jet lag could permanently (永久性的) affect memory.
According to the text, jet lag _________.
A. can cause difficulties in speaking
B. can make people feel tired for a few weeks
C. can be only found in flight attendants
D. can be caused by flying over several time zones
It can be inferred from the text that _________.
A. the conclusion is refused by many scientists
B. scientists fear that this research is not done properly
C. every scientific conclusion needs the support from many tests
D. the women who were examined in the research were not healthy
From the result of the research we can see that _________.
A. the women who have longer rest at home show better memory
B. the women who fly in short time have smaller right temporal lobes
C. the women who have longer flights fail the memory test
D. the women who rest more than 14 days produce less hormones
What is the subject discussed in the text?
A. The cause of jet lag. B. A story of a group of flight attendants.
C. The importance of having enough rest after flights.
D. A research about the effects of jet lag on the brain.
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科目：高中英语 来源： 题型：阅读理解
A new study says one part of the human brain may become smaller as the result of a condition known as jet lag. Jet lag results from flying long distances in an airplane. People with jet lag may feel extremely tired for several days. They may also have problems thinking clearly and remembering.?
Recently a researcher at the University of Bristol in Britain reported the findings of his jet lag study, which involved twenty young women who worked for international airlines. They had served passengers on airplanes for five years. These flight attendants flew across many countries and at least seven time zones. In the study, the flight attendants had different amounts of time to recover from jet lag. Half the women spent five days or fewer in their home areas between long flights. The other half spent more than fourteen days in their home areas.?
The researcher took some saliva from the women's mouths to measure levels of a hormone(荷尔蒙) that increases during stress. He tested them to see if they could remember where black spots appeared on a computer screen. And he took pictures of their brains to measure the size of the brain's temporal lobes(脑叶).?
It was found that the women who had less time between flights had smaller right temporal lobes. This area of the brain deals with recognizing and remembering what is seen. The same group performed worse and had slower reaction times on the visual memory test. And their saliva samples showed higher levels of stress hormones.?
The researcher believes the brain needs at least ten days to recover after a long trip. He says airline workers told him their ability to remember got worse after working on planes for about four years. Other studies have shown that increased feelings of stress can cause a loss of cells in the part of the brain that controls memory.?
Scientists say more tests are needed to study the effects of jet lag on the brain. They want to find out if too much jet lag could permanently affect memory.?
According to the text, jet lag _______.?
A. can cause difficulties in speaking
B. can make people feel tired for a few weeks?
C. can be only found in flight attendants
D. can be caused by flying over several time zones?
It can be inferred from the text that _______.
A. the conclusion is refused by many scientists?
B. scientists fear that this research is not done properly?
C. every scientific conclusion needs the support from many tests?
D. the women who were examined in the research were not healthy?
From the result of the research we can see that _______.
A. the women who have longer rest at home show better memory?
B. the women who fly in short time have smaller right temporal lobes?
C. the women who have longer flights fail the memory test?
D. the women who rest more than 14 days produce less hormones?
What is the subject discussed in the text??
A. The cause of jet lag.?
B. A story of a group of flight attendants.?
C. The importance of having enough rest after flights.?
D. A research about the effects of jet lag on the brain.??
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科目：高中英语 来源：广东省广州市执信中学2010届高三上学期期末考试 题型：阅读理解
The effects of rapid travel on the body are actually far more disturbing than we realize. Jet Lag is not a psychological consequence of having to readjust to a different time zone. It is due to changes in the body’s physiological regulatory mechanisms, specifically the hormonal systems, in a different environment.
Now that we understand what Jet Lag is, we can go some way to overcome it. A great number of the body’s events are scheduled to occur at a certain time of day. Naturally these have to be regulated, and there are two regulatory systems which interact.
One timing system comes from the evidence of our senses and stomachs, and the periodicity we experience when living in a particular time zone. The other belongs in our internal clocks (the major one of which may be physically located in a part of the brain called the suprachiasmatic nucleus) which, left alone, would tie the body to a 25-hour rhythm. Normally the two timers are in step, and the surroundings tend to regularize the internal clocks to the more convenient 24-hour period.
If, however, you move the whole body to a time zone which is four hours different, the two clocks will be out of step, like two alarm clocks which are normally set together, but which have been reset a few hours apart. Whereas the two clocks would normally sound their alarms together, now they ring at different times. Similarly, the body can be set for evening while the sun is rising.
In time the physiological system will reset itself, but it does take time. One easily monitored rhythm is palm sweating. A man flown to a time zone different by 10 hours will take eight days to readjust his palm sweat. Blood pressure, which is also rhythmical, takes four days to readjust.
What can we do about it? It is not feasible to wait four days until the body is used to the new time zone. Fortunately there is a short cut. It relies on two things-the power of the stomach to regulate the timing of other events, and the pharmacological actions of coffee. The basic assumptions are:
Coffee 
delays the body clock in the morning, and advances it at night. Coffee at mid-afternoon is neutral. Protein in meals stimulates wakefulness, while carbohydrates promote sleep. Putting food into an empty stomach helps synchronize the body clock.
46. What is jet lag associated with?
A. Psychological change. B. Physiological change.
C. Inexperience of rapid travel. D. Unfamiliar environment.
47. What helps us to adjust to a 24-hour rhythm?
A. Alarm clock. B. Suprachiasmatic nucleus in our brain.
C. Signals from outside of the body. D. Our senses and stomachs.
48. What do we know from the fifth paragraph?
A. A person moving to a different time zone will suffer from high blood pressure.
B. A person moving to a different time zone will sweat a lot.
C. Moving to a different time zone will affect both palm sweat and blood pressure.
D. If the rhythm of blood pressure and palm sweat are not in step, there will be jet lag.
49. What should we do if we want to stay awake?
A. To take coffee at three o’clock in the afternoon.
B. To have meals that contain lots of protein.
C. To have some carbohydrate drinks.
D. To stop putting food into our stomach.
50. How can we cure jet lag?
A. To sleep for days. B. To wait for self-recovery.
C. To drink tea. D. To get something to eat.
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科目：高中英语 来源：20112012学年云南省高三年级第一次月考英语试题 题型：阅读理解
Psychologists tell us that there are four basic stages that human beings pass through when they enter and live in a new culture．This process begins with the “honeymoon stage”．This is the period of time when we first arrive in which everything about the new culture is strange and exciting．We may be suffering from “jet lag” but we are thrilled to be in the new environment, seeing new sights, hearing new sounds and language, eating new kinds of food．This stage can last for quite a long time because we feel we are involved in some kind of great adventure．
Unfortunately, the second stage can be more difficult．After we have settled down into our new life, we can become very tired and begin to miss our homeland and our family, friends, pets．All the little problems in life seem to be much bigger and more disturbing when you face them in a foreign culture．This period of cultural adjustment can be very difficult and lead to rejecting or pulling away from the new culture．
The third stage is called the “adjustment stage”．This is when you begin to realize that things are not so bad in the host culture．Your sense of humour usually becomes stronger and you realize that you are becoming stronger by learning to take care of yourself in the new place．Things are still difficult, but you are now a survivor!
The fourth stage can be called “at ease at last”．Now you feel quite comfortable in your new surroundings．You can cope（deal） with most problems that occur．You may still have problems with the language, but you know you are strong enough to deal with them．
1.This passage mainly talks about ________．
|
A．culture and foreign language learning |
B．adventures in a foreign land |
|
C．getting used to a new culture |
D．the interaction of different cultures |
2.Which of the following best describes the first stage?
|
A．Lonely and depressed |
B．Bored and homesick |
|
C．Happy and excited |
D．Angry and frustrated |
3.According to the passage, people are most likely to return to their own culture at the ________stage．
|
A．1st |
B．2nd |
C．third |
D．fourth |
4.It can be concluded from the passage that ________．
|
A．people feel better in their own culture |
|
B．it is not easy to adapt to a new culture |
|
C．culture shock doesn’t occur at the beginning |
|
D．it is human nature to long for adventures |
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科目：高中英语 来源： 题型：阅读理解
Jet lag, caused by traveling between time zones，is becoming a common problem for frequent travelers：for 49 percent it is only a nuisance and for 45 percent it is a real problem. It is caused by disruption（混乱）to the internal biological clock，and may lead to digestive problems,tiredness,and sleep disruption.
Generally speaking，our biological clock is slightly disturbed if we just move into the next time zone，but jet lag becomes a problem once we have passed through three or four time zones. The body takes about one day to get over each hour of time difference. But the seriousness of jet lag problems also depends on our direction of travel. If we go north or south，we won’t notice any difference，because there is
usually no time zone change. However if we travel west we will be in advance of ourselves as far as our internal clock is concerned，and problems may arise. A
west-to-east journey，on the other hand，makes us late compared to the local time. It often demands even greater effort in adjustment since we are not quick enough to catch up with the new time schedule. Therefore，a trip from New York to Los Angeles often causes fewer problems than a Los Angeles-New York trip.
1. A traveler who suffers from jet lag has problems in ____________.
A. adjusting his biological clock
B. knowing the direction of a jet
C. knowing the distance of his flight
D. getting used to the weather of a new place
2. If one travels across three time zones， he needs about ____________ hours to get over his jet lag problem.
A. 24 B. 36 C.48 D. 72
3. A person may suffer the most serious case of jet lag when he takes a ____________ journey.
A. east-to-west B. west-to-east C. north-to-south D. south-to-north
4. The main purpose of the passage is to ____________.
A. explain the cause of jet lag problems
B. teach us how to avoid jet lag problems
C. explain the differences between time zones
D. show the ways to lessen the degree of jet lag problems
5. What does affect the biological clock?
A. healthy body B. direction C. time zones D. sleeping
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