问题 选择题

下列说法正确的是(   )

A.25 ℃时NH4Cl溶液的Kw大于100 ℃时NaCl溶液的Kw

B.SO2通入碘水中,反应的离子方程式为SO2+I2+2H2O====SO32+2I+4H

C.加入铝粉能产生H2的溶液中,可能存在大量的Na、Ba2、AlO2、NO3

D.100 ℃时,将pH=2的盐酸与pH=12的NaOH溶液等体积混合,溶液显中性

答案

答案:C

A项,水的离子积Kw仅是温度的函数,温度越高,Kw越大,与溶液中的溶质无关,A错误;B 项,I2具有较强氧化性,能将SO2氧化,正确的离子方程式是SO2+I2+2H2O====SO42+4H+2I,B错误;C项,加入铝粉能产生氢气的溶液可能是强碱性溶液,也可能是酸性溶液,若是强碱性溶液,Na、Ba2、AlO2、NO3可以大量共存,正确;D项,100 ℃时,Kw=1.0×10-12,pH=2的盐酸c(H+)="0.01" mol/L, pH=12的NaOH溶液c(OH)="1" mol/L,若等体积混合溶液显碱性,D错误。

完形填空

第二节 完型填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

All the World Asks

On my first day in a college classroom, I felt like an overgrown child returning to civilization after having been lost in the forest for thirty years. There I sat,  21  enough to be a father to most of the students in the room,   22   unconfident enough to be their baby brother. We were crowded elbow (肘部) to elbow, listening to a  23  who looked even younger than the students. I felt uncomfortable and out of place as the professor carefully    24  what she expected us to learn. As I listened, I couldn't help but  25  of my own oldest daughter who was now beginning her first year in    26  , just like me. I remembered how hard I had tried to help build self-confidence in her and my other children. So why did I suddenly feel like a scared   27  myself'? When I walked out of that classroom, I had serious    28   about my ability to make it   29  college. Not until late that night did my thinking   30    .It was a long-distance  31   from my daughter, my fellow college freshman, that did the trick. She spoke on the phone about the doubts, worries and anxieties she was   32 . She was certain that she'd never   33  at college. How   34   her worries sounded! In my most confident parental   35  , I said, “Doing your best is all the world   36  .” The next day in class, those words still repeated in my head. When the professor raised a   37   for the class, nobody, including me,    38  to answer. When I looked around al the   39   and uncertainty on the young faces in that room, I knew   40  what I had to do: my best. That's all the world asks. So I raised my hand, and the professor called my name. I spoke.

21. A. big                      B. tall                   C. old                    D. strong

22. A. and               B. so               C. or             D. yet

23. A. professor                   B. teacher                C lecturer           D. instructor

24. A. showed                   B. explained              C. designed         D. offered

25. A. think                     B. speak                    C. talk               D. hear

26. A. school                    B. office                C. classroom         D. college

27. A. father                     B. parent                 C. child           D. son

28. A. fears                B. doubts                  C. opinions         D. ideas

29. A. over                     B. on                    C. with                   D. through

30. A. stop                      B. turn                  C. change                 D. continue

31. A. call                       B. talk                   C. report              D. discussion

32. A. obtaining                  B. gaining                C. experiencing   D. feeling

33. A. fail                      B. succeed                C. win            D. pass

34. A. common                   B. ordinary               C. regular                 D. familiar

35. A. sound                     B. whisper                C. word           D. voice

36. A. hopes                     B. asks                  C. wants              D. expects

37. A. request                    B. problem               C. question          D. demand

38. A. dared                     B. preferred               C. tried                   D. prepared

39. A. sorrow                   B. joy                   C. fear            D. anger

40. A. exactly                    B. roughly               C. gradually               D. Certainly

单项选择题