问题 单项选择题 A1型题

关于肺水肿的发病机制不正确的解释是()

A.肺泡及肺泡间隔毛细血管通透性增加

B.血管活性物质释放

C.与细胞色素氧化酶的三价铁结合

D.肺淋巴循环梗阻

E.缺氧

答案

参考答案:C

解析:发病机制:1.通透性增高,主要是由于肺毛细血管内皮和/或肺泡上皮通透性增高。微血管壁通透性增高可能与某些化学介质,如组胺、缓激肽,前列腺素、白细阴离子蛋白和蛋白水解酶等的作用有关。2.毛细血管流体静压增高3.血浆胶体渗透压下降4.淋巴管功能不全,肺淋巴管病变导致排流不全,可致肺液体交换失衡。

阅读理解

阅读理解

     Living in a green area can make you live longer, according to the research published today. The

research also shows that the difference in life expectancy (平均寿命) between rich and poor becomes

smaller among those who live in an environment with parks and trees.

     Richard Mitchell, from Glasgow University, and his colleagues, found that the gap between the

number of deaths of people on high incomes and the number of deaths of those on low incomes in

green areas was half that compared with figures relating to builtup areas.

     Green spaces, classified by the researchers as "open, undeveloped land with natural vegetation",

encouraged people to walk and be more active. Exercise in these settings could have greater benefits

than exercise elsewhere, the researchers said.

     The benefits potentially go beyond exercise. Studies have shown that being around green spaces

can reduce blood pressure and stress levels, and possibly help patients recover faster.

     A number of researchers have looked at the effects of greenery on our wellbeing. But few studies

had looked at whether living in green areas reduced health inequalities, the Glasgow team said.

     Using information from a landuse database of 2001, the researchers divided the preretirement

population of England into four groups according to income level, and five groups according to access

to green space. They then looked at death rate for 2001-2005.

     They found that the inequality in death rate from all causes relating to lack of money was less in

those populations in the greenest areas compared with the figures for people living in more builtup

places. They found an even stronger relationship when it came to deaths from certain diseases such

as heart conditions and stroke (中风). There was no difference, however, in deaths from lung cancer.

     The researchers said that changing the physical environment was an easier way to fight against poor

health than using media campaigns or giving out information on health. "The result of the study is clear,

environments that promote good health might be very important in the fight to reduce health inequalities."

1. The underlined word "that" in Paragraph 2 refers to ________.

A. the gap                          

B. the number of deaths

C. the income                      

D. the living area

2. What was the special point of the Glasgow team's research? 

A. They offered a scientific definition of "green spaces". 

B. They encouraged people to exercise in green areas.

C. They studied the effects of greenery on people's diseases.

D. They focused on the influence of greenery on health inequalities.

3. What advice would the researchers probably give according to the last paragraph? 

A. More health information should be given to the public.

B. People should take more exercise every day.

C. More trees and grasses should be planted in cities.

D. People should fight against health inequality.

4. What is the main idea of the passage?  

A. People should live in green areas.

B. Green spaces promote good health.

C. Income influences health less than environment.

D. Exercise in green areas benefits people a lot.

单项选择题