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.


【小題1】B
【小題2】C
【小題3】C
【小題4】B
【小題5】D

解析

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科目：高中英語 來源：2012-2013學(xué)年浙江省高三第九次教學(xué)質(zhì)檢英語試卷（解析版） 題型：閱讀理解

Many trees in the Brackham area were brought down in the terrible storms that March. The town itself lost two great lime trees from the former market square. The disappearance of such striking features had changed the appearance of the town center entirely, to the annoyance of its more conservative inhabitants(居民).

Among the annoyed, under more normal circumstances, would have been Chief Inspector Douglas Pelham, head of the local police force. But at the height of that week's storm, when the wind brought down even the mature walnut tree in his garden, Pelham had in fact been in no fit state to notice. A large and healthy man, he had for the first time in his life been seriously ill with an attack of bronchitis.

When he first complained of an aching head and tightness in his chest, his wife, Molly, had tried to persuade him to go to the doctor. Convinced that the police force could not do without him, he had, as usual, ignored her and attempted to carry on working. Predictably, though he wouldn't have listened to anyone who tried to tell him so, this had the effect of fogging his memory and shortening his temper.

It was only when his colleague, Sergeant Lloyd, took the initiative (主動) and drove him to the doctor's door that he finally gave in. By that time, he didn't have the strength left to argue with her. In no time at all, she was taking him along to the chemist's to get his medicine and then home to his unsurprised wife who sent him straight to bed.

When Molly told him, on the Thursday morning, that the walnut tree had been brought down during the night, Pelham hadn’t been able to take it in. On Thursday evening, he had asked weakly about damage to the house, groaned (含糊不清地說) thankfully when he heard there was none, and pulled the sheets over his head.

It wasn't until Saturday, when the medicine took effect, his temperature dropped and he got up, that he realized with a shock that the loss of the walnut tree had made a permanent difference to the appearance of the living-room. The Pelhams’ large house stood in a sizable garden. It had not come cheap, but even so Pelham had no regrets about buying it. The leafy garden had created an impression of privacy. Now, though, the storm had changed his outlook.

Previously, the view from the living-room had featured the handsome walnut tree. This had not darkened the room because there was also a window on the opposite wall, but it had provided interesting patterns of light and shade that hid the true state of the worn furniture that the family had brought with them from their previous house.

With the tree gone, the room seemed cruelly bright, its worn furnishings exposed in all their shabbiness. And the view from the window didn’t bear looking at. The tall house next door, previously hidden by the tree, was now there, dominating the outlook with its unattractive purple bricks and external pipes. It seemed to have a great many upstairs windows, all of them watching the Pelhams' every movement.

“Doesn’t it look terrible?” Pelham whispered to his wife. But Molly, standing in the doorway, sounded more pleased than dismayed. “That's what I’ve been telling you ever since we came here. We have to buy a new sofa, whatever it costs.”

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       A．Educators.                                          B．Crime experts.

       C．The old and the lonely.                         D．The children and their parents.

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