问题 单项选择题 A1/A2型题

欲显示各种酶的组织切片,应选择下列哪种固定液?()

A.95%乙醇

B.AF液

C.丙酮

D.10%中性甲醛

E.75%乙醇

答案

参考答案:C

解析:丙酮的作用是沉淀蛋白质和糖,它对组织穿透性很强,保存抗原的免疫活性的效果较好。

完形填空

根据文章内容,从方框A-F选项中,选出每一段的小题或能概括主题思想的最佳选项,选项中有一项为多余选项。

A. The Introduction of Paris

B. The Culture of Paris

C. The Population Growth in Paris

D. The Production of Paris

E. The Education in Paris

F. The Industries in Paris

小题1:_____________________

Paris, the capital and the largest city of the country, is in north central France. The Paris metropolitan area contains nearly 20% of the nation’s population and is the economic, cultural, and political center of France. The French government have historically favored the city as the site for all decision making, thus powerfully attracting nearly all of the nation’s activities.

小题2:_____________________

Paris has grown steadily since it was chosen as the national capital in the late 10th century. With the introduction of the Industrial Revolution, a great number of people moved to the city from the country during the 19th century. The migration was especially stimulated by the construction of railroads, which provided easy access to the capital. After World War II more and more immigrants arrived.

小题3:____________________

The city is the centralized(中央集权) control point of most national radio and television broadcasting. It is a place of publication of the most prestigious(有威望的)newspapers and magazines and an international book publishing center. With more than 100 museums, Paris has truly one of the greatest concentrations of art treasures in the world. The Louvre, opened as a museum in 1793, is one of the largest museums in the world.

小题4:___________________

In the late 1980s about 4.1 million pupils annually attended about 47,000 elementary schools. In addition, about 5.4 million students attended some 11,200 secondary schools. Approximately 1.2 million students were enrolled(录取) annually at universities and colleges in France in the late 1980s. French centers of learning have served as academic models throughout the world.

小题5:___________________

Paris is the leading industrial center of France, with about one quarter of the nation’s manufacturing concentrated in the metropolitan area. Industries of consumers goods have always been drawn to Paris by the enormous market of the big population; and modern, high-technology industries also have become numerous since World War II. Chief manufactures are machinery, automobiles, chemicals and electrical equipment.

单项选择题