问题 选择题

下列有关化学反应过程或实验现象的叙述中,正确的是

A.氯气的水溶液可以导电,说明氯气是电解质

B.漂白粉和明矾都常用于自来水的处理,二者的作用原理是相同的

C.氯气可以使湿润的有色布条褪色,但实际起漂白作用的物质是次氯酸而不是氯气

D.为证明氯水中含Cl,可先加盐酸酸化,再加入AgNO3溶液

答案

答案:C

题目分析:A、氯气的水溶液可以导电,是因为Cl2与H2O反应生成了HCl等电解质,错误;B、漂白粉可杀菌消毒,明矾可用来吸收水中的悬浮性杂质,作用原理不同,错误;C、Cl2与H2O反应生成HClO,HClO起漂泊作用,正确;D、检验Cl‾,不能用HCl酸化,错误。

判断题
阅读理解

Girls really do prefer pink and boys prefer blue, recent research shows.

The reasons could have its origins in the hunt for food on the African savannah(稀树草原) thousands of years ago. Evolution may have developed women’s preference for pink, perhaps because it helped them to find ripe fruit and healthy men with reddish faces, while both men and women have a natural desire for blue, according to scientists at Newcastle University.

“Everyone in today’s western culture, from parents to toy manufactures, seems to assume that little girls like pink.” Said Prof. Anya Hulbert, who wanted to find out whether the reason was cultural or to do with biology.

A love of salmon, fuchsia and coral does seem to be rooted into females, rather than picked up from their mothers.

The participants in the study were Chinese and British. The Chinese students showed a marked preference for red. “Culture may contribute to this natural female preference.” Said Pro. Hulbert.

In her experiments, 208 young adult men and women were asked to select, as rapidly as possible, their preferred color. Hulbert and her colleague Dr. Yazhu Ling marked the results and found that while men preferred blue, women tended to choose pink.

Hulbert said she could only infer about the preference for blue: “Here again, I would favor evolutionary arguments. Going back to our savannah’s days, we would have a natural preference for a clear blue sky, because it signaled good weather. Clear blue also signals a good water source.”

60.The passage mentions “the African savannah” to show that____.

A.the ancient Africa was a beautiful place.

B.human beings lived in African at first.

C.women and men have different color preferences.

D.Color preference has its historical origins.

61.It can be inferred that the underlined word “fuchsia”_____.

A.is probably a kind of toy

B.is probably pink in color

C.can be only found in Africa

D.hardly causes men’s interest

62.By saying “The Chinese students… for red.” in paragraph 5, the writer means______.

A.red is the Chinese student’s favorite color

B.the Chinese prefer red more than the British

C.culture influences people’s color preferences

D.the study was carried out by two nations

63.What can we know from the last paragraph?

A.Hulbert thinks evolution explains why people prefer blue

B.Hulbert has a strong desire for “savannah” days

C.Blue is a natural signal of many good things

D.While boys like blue, girls like pink.