问题 选择题

常温下测得某溶液中由水电离出的c(H+)=1×10-13mol·L-1,那么该溶液中还一定存在的离子是

A.AlO2、ClO-、Na+

B.Mg2+、SO2-4、Cl-

C.Fe2+、Cu2+、NO3

D.Ba2+、K+、NO3

答案

答案:D

常温下测得某溶液中由水电离出的c(H+)=1×10-13mol·L-1,即该溶液为抑制水的电离,则该溶液可能是酸性溶液,也可能是碱性溶液。

A选项中,AlO2、ClO-在酸性溶液中不能大量共存;B选项中Mg2+在碱性溶液中不能大量共存;C选项中,Fe2+、Cu2+在碱性溶液中不能大量共存,且Fe2+、NO3在酸性溶液中会发生氧化还原反应,也不能大量共存。

单项选择题
阅读理解

I entered high school having read hundreds of books. But I was not a good reader. Merely bookish, I lacked a point of view when I read. Rather, I read in order to get a point of view. I searched books for good expressions and sayings, pieces of information, ideas, themes—anything to enrich my thought and make me feel educated. When one of my teachers suggested to his sleepy tenth-grade English class that a person could not have a “complicated idea” until he had read at least two thousand books, I heard the words without recognizing either its irony (嘲讽) or its very complicated truth. I merely determined to make a list of all the books I had ever read. Strict with myself, I included only once a title I might have read several times. (How, after all, could one read a book more than once?) And I included only those books over a hundred pages in length. (Could anything shorter be a book?)  

There was yet another high school list I made. One day I came across a newspaper article about an English professor at a nearby state college. The article had a list of the “hundred most important books of Western Civilization.” “More than anything else in my life,” the professor told the reporter with finality , “these books have made me all that I am.” That was the kind of words I couldn’t ignore. I kept the list for the several months it took me to read all of the titles. Most books, of course, I hardly understood. While reading Plato's The Republic, for example, I needed to keep looking at the introduction of the book to remind myself what the text was about. However, with the special patience and superstition (迷信) of a schoolboy, I looked at every word of the text. And by me time I reached the last word, pleased, I persuaded myself that I had read The Republic, and seriously crossed Plato off my list

小题1: On heating the teacher's suggestion of reading, the writer thought _______.

A.one must read as many books as possible

B.a student should not have a complicated idea

C.it was impossible for one to read two thousand books

D.students ought to make a list of the books they had read小题2:While at high school, the writer _______.    

A.had plans for reading

B.learned to educate himself

C.only read books over 100 pages

D.read only one book several times小题3:The underlined phrase “with finality” probably means _______.

A.firmly

B.clearly

C.proudly

D.pleasantly小题4:The writer's purpose in mentioning The Republic is to _______.

A.explain why it was included in the list

B.describe why he seriously crossed it off the list

C.show that he read the books blindly though they were hard to understand

D.prove that he understood most of it because he had looked at every word小题5:The writer provides two book lists to _______.

A.show how he developed his point of view

B.tell his reading experience at high school

C.introduce the two persons' reading methods

D.explain that he read many books at high school