问题 单项选择题

消除支气管哮喘气道炎症最有效的药物是()

A.糖皮质激素

B.抗生素

C.抗组织胺药

D.β2受体激动剂

E.色甘酸钠

答案

参考答案:A

解析:哮喘病的病理基础是慢性非特异性炎症,糖皮质激素是目前控制发作最有效的抗炎药物。主要作用机制是抑制炎症细胞的迁移和活化;抑制细胞因子的生成;抑制炎症介质的释放;增加平滑肌细胞β2受体的反应性。可分为吸入、口服和静脉用药。吸入治疗是目前推荐长期抗感染治疗哮喘的最常用方法。

阅读理解

阅读理解

     I travel a lot, and I find out different "styles" (风格) of directions every time 1 ask "How can I get to

the post office?"

     Foreign tourists are often confused (困惑) in Japan because most streets there don't have names; in

Japan, people use landmarks (地标) in their directions instead of street names. For example, the Japanese will say to travelers, "Go straight down to the corner. Turn left at the big hotel and go past a fruit market.

The post office is across from the bus stop."

     In the countryside of the American Midwest, there are not usually many landmarks. There are no

mountains, so the land is very flat; in many places there are no towns or buildings within miles. lnstead of

landmarks, people will tell you directions and distances. In Kansas or Iowa, for example, people will say, "Go north two miles. Turn east, and then go another mile."

     People in Los Angeles, California, have no idea of distance on the map; they measure distance in time, not miles. "How far away is the post office?" you ask. "Oh," they answer, "it's about five minutes from here." You say, "Yes, but how many miles away is it?" They don't know.

     It's true that a person doesn't know the answer to your question sometimes. What happens in such a

situation? A New Yorker might say, 'Sorry, I have no idea." But in Yucatan, Mexico, no one answers "I

don't know." People in Yucatan believe that "I don't know" is impolite, They usually give an answer,

often a wrong one. A tourist can get very, very lost in Yucatan!

1. When a tourist asks the Japanese the way to a certain place they usually _________

A. describe the place carefully

B. show him a map of the place

C. tell him the names of the streets

D. refer to recognizable(可辨认的) buildings and places

2. What is the place where people measure distance in time?

A. New York.  

B. Los Angeles.  

C. Kansas.  

D. Iowa.

3. People in Yucatan may give a tourist a wrong answer ________

A. in order to save time  

B. as a test 

C. so as to be polite  

D. for fun

4. What can we infer from the text?

A. It's important for travelers to understand cultural differences.

B. It's useful for travelers to know how to ask the way properly.

C. People have similar understandings of politeness.

D. New Yorkers are generally friendly to visitors.

问答题