问题 单项选择题

有关结核杆菌引起的变态反应,下列叙述哪项是错误的

A.为身体组织对结核菌及其代谢产物产生的过敏反应

B.多发生于结核菌侵入人体后4~8周

C.局部可出现渗出性炎症,但不出现干酪样坏死

D.结核菌素试验呈阳性反应

E.可出现皮肤结节性红斑

答案

参考答案:C

解析:[考点] 结核的变态反应过程[分析] 结核变态反应为身体组织对结核菌及其代谢产物产生的过敏反应,一般发生于结核菌侵入人体后4~8周,此种反应可使局部出现渗出性炎症,也可出现干酪性坏死,常可伴发热。此时行结核菌素试验可呈阳性反应,为Ⅳ型变态反应。结核菌感染后还可发生多发睦关节炎、皮肤结节性红斑等。

阅读理解

The desire to make explorations is born with man. Wherever his imagination goes, man also has a strong wish to go. A large part of human history is connected with the exploration of the world in which we live. Again and again people have set out with surprising courage and patience to look into unknown regions and lands to see what had not yet been seen, to make known the unknown. With kites, balloons and aircraft they left the ground to pass through the lower atmosphere. Now the outer space receives their attention.

Why should man take the trouble of exploring space? It is hard to list the specific practical benefits that will result in. But one knows, from past experience in other areas, that man will surely see and discover new things in space that will increase our scientific knowledge, and this new knowledge will find its way into valuable practical uses. What we learn about man himself, from his experience in space, and from the effects of space and the space flight environment on him, will be extremely valuable. The new techniques developed to carry out the exploration of space, and to keep man alive in space, will certainly find practical uses in everyday life in some way. The areas that will benefit are manifold. They include communication, generation of power, transportation and travel, food production, materials, fuels and many others. But to say exactly what the practical results will be is almost impossible.

1. The main idea of the first paragraph is that __________.

A. man often goes wherever his dreams go

B. man desires to explore what is unknown

C. man is no longer interested in the study of the land and sea now

D. man's history is his exploration of the world

2. The word "manifold" in the second paragraph probably means ________ .

A. of value       B. of use       C. in a way      D. in many ways

3. The author seems to be in favor of ____.

A. the exploration of space

B. doubting the necessity of the space exploration

C. exploring more in space than in sea         

D. his experience in space

4. In the last sentence of paragraph 2 ,the phrase "practical results" refers to the results ______.

A. that can be made use of

B. that can be learned as knowledge

C. that are obtained from experience         

D. helping us make further exploration

名词解释