两个质量不同的小球用长度不等的细线拴在同一点，并在同一个水平面内做匀速圆周运动，

改革开放30多年来北京城镇居民家庭的恩格尔系数变化表

北京城镇居民恩格尔系数变化表明，北京市民

A．消费结构不断改善，生活水平提高

B．社会保障不断完善

C．以发展资料和享受资料的消费为主

D．家庭食品支出额在减少

在我国证券公司向客户收取的佣金不得高于证券交易金额的( )，也不得低于代收的证券交易监管费和证券交易所手续费等。

A．2‰

B．3‰

C．3.5‰

D．5‰

第二节：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，然后从各题所给的四个选项（A、B、C、D）中，选出最佳选项。

Home, sweet home

It was December 22. The cold wind swept the countless snowflakes(雪花） across my front yard. My dad was there sweeping the  36  . His nose was __37___as a cherry. With every breath he took, a white puff(水气) ran into the air.

Inside, my mother was  38  the last of the boxes. As I entered the front door, the  39  that after today I wouldn’t enter through that door ever again  40  a hole in my stomach. I picked up my dog and sat Indian style with him in my arms on the  41  , wooden floor. I had no  42  but to sit on the floor, for there was no longer any furniture existing in my house. I sat there in a daze（恍惚）, just  43  . There was no reason for my parents to make me, a once  44  12-year-old kid,  45  . I had two best friends right across the street; I did well in school and I always kept my room clean.  46  , this was “my house”. By no means did I want a couple of  47  living here. These recurring（重复）thoughts  48  around in my mind and I couldn’t find an answer.

Out of the front window I could see the orange top of a truck pulling in the cleaned driveway and I knew it was the other U-Haul. Instantly three men came  49  in the back door like World War III was starting.

I watched  50  as the men, my mother and my dad carried our belongings to the truck. My dog even winced（畏缩）as he stared out of the window. I wondered if he was  51  , too, or if he just wished to play outside in the snow.

My mum came in, looking solemn（凝重）. She turned   52  the overhead light, put the  53  in my arm and took me out of the back door. A totally  54  feeling filled my heart. For the first time in my life ,I wondered what  55  would be to me tomorrow.

36. A. stairs       B. garden          C. sidewalk     D. driveway

37. A. red              B. black     C. white     D. blown

38. A. piling      B. packing      C. collecting   D. locking

39. A. wish        B. dream     C. thought      D. worry

40. A. cut              B. burned          C. shot       D. made

41. A. cold        B. wet        C. broken          D . messy

42. A. choice     B. way       C. solution      D. means

43. A. dreaming     B. thinking     C. staring          D. crying

44. A. hardworking       B. clever     C. happy     D. honest

45. A. remain     B. cry        C. suffer     D. move

46. A. However      B. Besides      C. Therefore   D. Yet

47. A. neighbours   B. strangers    C. visitors       D. elders

48. A. occurred      B. traveled      C. danced          D. flowed

49. A. running          B. laughing     C. talking          D. wispering

50. A. curiously     B. strangely    C. carefully    D. helplessly

51. A. afraid      B. angry     C. sad        D. lonely

52. A. down      B. off         C. on         D. up

53. A. box         B. dog        C. bag        D. hand

54. A. excited     B. eager     C. empty     D. angry

55. A. place       B. school    C. home    D. world

铸铁管泄漏抢修时泄漏处开挖后，宜对泄漏点采取措施进行（）。

A、夹管

B、夹套封焊

C、临时封堵

D、带气作业

怀孕后哪一期最易发生出生缺陷（）

A、孕早期

B、孕中期

C、孕晚期