下列有关中国古代自耕农经济的表述，正确的是（）①首先出现于春秋时期②以家庭为生产生活

有机磷酸酯类中毒出现M样作用的原因是：

A．胆碱能神经递质释放增加

B．胆碱能神经递质水解减少

C．胆碱能神经递质合成增加

D．直接激动M受体

E．M胆碱受体敏感性增加

III. 阅读理解

That“Monday morning feeling”could be a crushing pain in the chest which leaves you sweating and gasping for breath. Recent research from Germany and Italy shows that heart attacks are more common on Monday mornings and doctors blame the stress of returning to work after the weekend break.

　　The risk of having a heart attack on any given day should be one in seven, but a six-year study helped by researchers at the Free University of Berlin of more than 2, 600 Germans showed that the average person had a 20 percent higher chance of having a heart attack on a Monday than on any other day.

　　Working Germans are particularly not protected against attack, with a 33 percent higher risk at the beginning of the working week. Non-workers, by comparison, appear to be no more at risk on a Monday than any other day.

　　A study of 11, 000 Italians proved 8 a. m. on a Monday morning as the most stressful time for the heart, and both studies showed that Sunday is the least stressful day, with fewest heart attacks in both countries.

　　The finding could lead to a better understanding of what is the immediate cause of heart attacks, according to Dr Stefan Willich of the Free University. “We know a lot about long-term risk factors such as smoking and cholesterol（胆固醇）but we don’t know what actually causes heart attacks, so we can’t give clear advice on how to prevent them, ”he said.

　　Monday mornings have a double helping of stress for the working body as it makes a rapid change from sleep to activity, and from the relaxing weekend to the pressures of work.

　　“When people get up, their blood pressure and heart rate go up and there are hormonal（内分泌）changes in their bodies, ”Willich explained. “All these things can have an unfavorable effect in the blood system and increase the risk of a clot（血凝块）which will cause a heart attack.”

　　“When people return to work after a weekend off, the pace of their life changes. They have a higher workload, more stress, more anger and more physical activities,”said Willich.

51. Monday morning feeling, as this passage shows, ________.

　A. is not as serious as people thought

　B. is the first killer in Germany and Italy

　C. is created by researchers in Germany and Italy

　D. is harmful to working people in developed countries

52. To protect people from a heart attack, doctors have paid much attention to ________.

　A. people’s working time　　　　　 B. people’s living place

　C. people’s diet and lifestyle　　　　 D. people’s nationalities

53. It can be learned from this passage that the heart attack has something to do with all the following EXCEPT ________.

A. blood pressure　　　　　　　　 B. heart rate

　C. hormonal changes　　　　　　　D. blood type

54. If the researchers give us some advice to avoid Monday morning feeling, what might it be?

　A. Improve working conditions.　　　B. Never go to work on Mondays.

　C. Stay with a doctor on Mondays.　　D. Get up late on Monday mornings.

成人颅高压的主要X线征象是（）

A.头颅增大

B.囟门增宽

C.颅缝分离

D.脑回压迹增多

E.蝶鞍萎缩脱钙

我国消防组织有（）形式

①公安消防队

②职业消防队

③义务消防队

④专职消防队

A、①②③

B、①③④

C、③④

D、①②④