42岁经产妇，因葡萄胎行全子宫切除术。病理检查：子宫肌深层镜下见肿大绒毛，滋养细胞高

类推性原理是指理论上，世界上一切事物的运动和变化都是有规律的，因此也是可预测的。

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.

下列四个选项中，错误的一项为( )。

A．从狭义上讲，法律是专指国家立法机关制定的在全国范围内具有普遍约束力的规范性文件
B．合法性原则是指行政管理权的存在与行使，必须依据法律、符合法律，不得与法律相抵触
C．在任何情况下，行政机关都不能采取任何与现行法律相抵触的措施
D．行政法律规范是国家制定的，并由国家强制力保障其执行的，调整国家行政管理活动中所产生的社会关系的行为规则

第一次卫生革命的主要任务是预防（）

A．传染病

B．急性病

C．常见病

D．慢性病

E．血吸虫病

什么是胀轨跑道？