问题 单项选择题 A1/A2型题

能够区分盐酸吗啡与磷酸可待因的试剂为()

A.稀铁氰化钾试液

B.氨试液

C.甲醛硫酸试液(Marquis试液)

D.铜吡啶试液

E.钼硫酸试液

答案

参考答案:A

解析:吗啡具弱还原性,其水溶液加稀铁氰化钾试液,吗啡被氧化生成伪吗啡,而铁氰化钾被还原为亚铁氰化钾,再与试液中的三氯化铁反应生成普鲁士蓝.可待因无还原性,不能还原铁氰化钾,故此反应为吗啡与可待因的区分反应。

解答题
阅读理解

The Chinese word “Shanzhai” means a small mountain village, but now it becomes an accepted name for fakes (假货), after “Shanzhai Cell-phones” produced by small workshops in southern China became popular in the mainland market over the past two years.

Besides “Shanzhai” electronic products, there are “Shanzhai” movies, “Shanzhai” stars and even a “Shanzhai” Spring Festival Gala (联欢晚会), a copy of the 25-year-old traditional show presented by CCTV on Chinese Lunar New Year’s Eve.

“Shanzhai” has become a culture of its own, meaning anything that imitates something famous.

In Chongqing, “Shanzhai” version “Bird’s Nest” and “Water Cube” woven by farmers with bamboo attract wide attention from tourists. Both are copies of the famous Olympic buildings in Beijing.

A literature critic said that taking the “Shanzhai” Gala as an example, when the traditional CCTV program becomes less and less attractive to the audience, the“Shanzhai” version appears timely to attract people. “Although it is often connected with poor techniques and operation, ‘Shanzhai’ culture meets the psychological needs of common people and could be a comfort to their minds,” he said.

To the mainstream (主流的) culture, the rise of “Shanzhai” culture is a challenge and a motivation (动力). People believe different kinds of cultures developing together is a perfect situation and it is for the public to choose.

小题1:The Chinese word “Shanzhai” may have started with ______.

A.Spring Festival Gala

B.electronic products

C.fake cell-phones

D.Olympic buildings小题2:According to the passage, “Shanzhai” culture refers to ______.

A.the action that a person imitates famous people

B.products with poor techniques and quality

C.those similar names to famous brands

D.anything that imitates something famous小题3:We can infer that the mainstream culture ______.

A.may develop faster because of the challenge of “Shanzhai” culture

B.is the challenge of “Shanzhai” culture

C.will be replaced by “Shanzhai” culture

D.is held back by “Shanzhai” culture