依据机体辐射剂量与临床类型的关系判断，下列哪个器官（组织）对放射损伤较敏感（）。A.

This year 2,300 teenagers ( young people aged from 13-19 ) from all over the world will spend about ten months in U.S. homes. They will attend U.S. schools, meet U.S. teenagers, and form impressions (印象) of the real American teenagers. American teenagers will go to other countries to learn new languages and have a new understanding of the rest of the world.

Here is a two-way student exchange in action. Fred, nineteen, spent last year in Germany with George's family. In return, George's son, Mike, spent a year in Fred's home in America.

Fred, a lively young man, knew little German when he arrived, but after two months study, the language began to come to him. School was completely different from what he had expected — much harder. Students rose respectfully (尊敬地) when the teacher entered the room. They took fourteen subjects instead of the six that are usual in the United States. There were almost no outside activities.

Family life, too, was different. The family's word was law, and all activities were around the family rather than one of the members. Fred found the food too simple at first. Also, he missed having a car.

“Back home, you pick up some friends in a car and go out and have a good time. In Germany, you walk, but you soon learn to like it.”

At the same time, in America, Mike, a friendly German boy, was also forming his idea. “I suppose I should criticize (批评) American schools.” he says. “It is far too easy by our level. But I have to say that I like it very much. In Germany we do nothing but study. Here we take part in many outside activities. I think that maybe your schools are better in training for citizens. There ought to be some middle ground between the two.”

小题1:The whole exchange program is mainly to ____.

A．help teenagers in other countries know the real America

B．send students in America to travel in Germany

C．let students learn something about other countries

D．have teenagers learn new languages小题2:What did Fred and Mike agree on?

A．American food tasted better than German food.

B．German schools were harder than American schools.

C．Americans and Germans were both friendly.

D．There were more cars on the streets in America.小题3: What is particular (特别的) in American schools?

A．There is some middle ground between the two teaching buildings.

B．There are a lot of after-school activities.

C．Students usually take 14 subjects in all.

D．Students go outside to enjoy themselves in a car.小题4:What did Mike think after experiencing the American school life?

A．A better education should include something good from both America and Germany.

B．German schools trained students to be better citizens.

C．American schools were not as good as German schools.

D．The easy life in the American school was more helpful to students.

使橡胶发生硫化的物质称作橡胶的（）。

A、化合剂

B、填充剂

C、硫化剂

D、炭黑

（20分）阅读下列材料并回答问题

材料一

鸦片战争前中国农村的家庭纺织业

古代中国的家庭纺织

材料二 中国民族资本主义企业变化

请回答：

（1）根据材料一指出我国传统经济的基本形式。（2分）

结合所学知识分析它在近代逐步瓦解的主要原因。（2分）

（2）根据材料二判断中国近代民族工业发展黄金时期出现的大致时间？（2分）

结合所学知识分析近代民族工业出现黄金时期的原因？（6分）

（3）20世纪20年代后民族资本家张謇的企业衰落下去，其主要原因有哪些？（2分）

（4）近代中国民族工业经过了曲折的发展历程，结合所学知识概括影响近代民族工业发展的主要因素。（6分）

血管紧张素转化酶抑制药（ACEI）的作用不包括（）

A.可降低心脏前、后负荷

B.可增强醛固酮的生成

C.可抑制缓激肽降解

D.可减轻心室扩张

E.可减少血管紧张素Ⅱ的生成

高效液相色谱法中，最常用的反相柱为（）柱，又称为（）柱，反相色谱中固定相极性比流动相极性（）。