问题 选择题

如图所示,ab为静电场中一条电场线上的两点,一个带正电的试探电荷只在电场力作用下从a 点沿直线运动到b 点。下列说法中正确的是

A.b点的电场强度比a点的电场强度大

B.b点的电势比a点的电势高

C.试探电荷在b点的电势能比在a点的电势能大

D.试探电荷在b点的速度比在a点的速度大

答案

答案:D

点电势高于点电势,带正电的试探电荷受到的电场力方向沿电场线方向,由过程中,电场力做正功,电势能减小,动能增加,D对。

单项选择题
完形填空

完形填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,掌握其大意,从每题所给的A、B、C、D四个选项中,选出最佳选项。

Only one woman is responsible for my success:my mom. Don' t  36 me—I'm like anyone else,and have issues with my mother. However,I'm  37  enough to realize that what she taught me when I was young positioned me for my later  38   .

My mom taught me that life,like dinner,doesn't require a recipe.  39 she cooked the most complicated meals,she  40 cooked from a recipe. It was like a kind of free-form jazz, and she taught me to improvise (即兴发挥), and to add ingredients according to  41 .It's no wonder that my media business has grown so amazingly; I'm not  42 anyone else's recipe.

When I was in the ninth grade,my mom decided she wanted something  43 being a mother and a wife. She wanted to start her own  44  .But in order to accomplish this,she had no  45  but to get a loan. It all happened in  46 motion. The bank manager   47 my father call him,but my mom said stubbornly,"Why? It's my loan." "Well,I can't give you a loan unless he co-signs," replied the manager. But my mom didn't  48 hope,and responded sincerely,"I see. Then can you do me a favor,if he does? I' d   49 it if you'd put together the paperwork quickly. I need a shop in order to support my family."

Moved by her  50 ,the manager agreed to do as she asked. So  51 was I that I included that day into my DNA.

Through her influence,I've become someone who   52  what she wants until she gets it. If something or someone is in my way,I   53  how to overcome the difficulties. It's really that  54 . It's not about getting angry. It's about getting what you want,being very, competitive,but also extremely  55 . I learned this in the ninth grade from my mom, and it burned itself into my brain.

36. A. suspect                B. misunderstand        C. scold          D. interrupt

37. A. curious                B. innocent         C. intelligent               D. straight forward

38. A. circumstances                        B. dilemmas(窘境) C. achievements    D. difficulties

39. A. Unless          B. If                          C. Since                 D. While

40. A. rarely                  B. increasingly       C. cautiously       D. flexibly

41. A. feature                 B. process           C. motivation       D. taste

42. A. undertaking          B. reflecting         C. recommending    D. following

43. A. instead of             B. rather than        C. more than                D. regardless of

44.A. business         B. marriage         C. research         D. interview

45.A. substitute        B. alternative         C. procedure       D. possibility

46.A. brief                    B. slow                   C. admirable        D. urgent

47.A. ordered          B. indicated         C. insisted           D. stressed

48.A. switch           B. abandon          C. adjust            D. escape

49.A. reward          B. relieve            C. celebrate        D. appreciate

50.A. determination      B. requirement        C. significance       D. encouragement

51.A. patient                B. sensitive           C. trustworthy       D. impressed

52.A. benefits         B. explores           C. compromises    D. pursues

53.A. turn out         B. stick out           C. figure out       D. watch out

54.A. simple                 B. upset             C. unconscious       D. uncertain

55.A. embarrassing       B. likeable           C. casual             D. confusing