题干

下列实验操作和理象、结论均正确且有因果关系的是(   )

选项

实验操作和现象

结论

A

向某溶液中滴加CCl4,振荡、静置,下层溶液显紫色

原溶液中含有I

B

常温下,0.1mol/LNaHSO3溶液的pH约为5

HSO3的电离程度大于其水解程度

C

相同温度下,测得饱和亚硫酸溶液的pH小于饱和碳酸溶液的pH

亚硫酸的酸性强于碳酸

D

向稀HNO3中加入过量的Fe粉,充分反应后,滴入KSCN溶液不显红色

稀HNO3将Fe氧化为Fe2+

A:A  

B:B  

C:C  

D:D

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答案(点此获取答案解析)

B

同类题1

根据短文内容,选择最佳答案。

    In the United States, when one becomes rich, he wants people to know it. And even if he does not become very rich, he wants people to think that he is. That is what “keeping up with the Joneses” is about. It is the story of someone who tried to look as rich as his neighbors.

    The expression was first used in 1913 by a young American called Arthur Momand. He told this story about himself. He began earning $ 125 a week at the age of 23. That was a lot of money in those days. He got married and moved with his wife to a very wealthy neighborhood outside New York City. When he saw that rich people rode horses, Momand went horseback riding every day. When he saw that rich people had servants, Momand and his wife also hired a servant and gave big parties for their new neighbors.

    It was like a race, but one could never finish his race because one was always trying to keep up. The race ended for Momand and his wife when they could no longer pay for their new way of life. They moved back to an apartment in New York City.

    Momand looked around him and noticed that many people do things just to keep up with rich lifestyle of their neighbors. He saw the funny side of it and started to write a series of short stories. He called it “Keeping up with the Joneses” because “Jones” is a very common name in the United States. “Keeping up with the Joneses” came to mean keeping up with rich lifestyle of the people around you. Momand's series appeared in different newspapers across the country for over 28 years.

    People never seem to get tired of keeping up with the Joneses. And there are “Joneses” in every city of the world. But one must get tired of trying to keep up with the Joneses because no matter what one does, Mr. Jones always seems to be ahead.