有浓度为4%的盐水若干克。蒸发了一些水分后浓度变成10%，再加入300克4%的盐水后

久期最长的债券是 ( )

A．高附息30年期债券

B．低附息30年期债券

C．零息30年期债券

D．无法判断

I am my mother’s third child. When I was born, her doctor gently explained to my mother that my left arm was    41   , below the elbow (肘部). Then he gave her some    42  . “Don’t treat her any    43   from the other girls. Demand more.” And she    44  .

My mother had to work to support our family. There were five girls in our family and we all had to    45  . Once when I was about seven, I came out of the    46  , “Mom, I can’t peel (削皮) potatoes. I only have one hand.”

“You get back to peel those potatoes, and don’t ever use that as a(n)    47   for anything again!”

Of course I could peel potatoes with my good hand while holding them down with my other arm. There was always a    48  , and Mom knew it. “If you try hard  49  ,” she’d say, “You can do anything.”

Once in the second grade, our teacher had each of us race across the monkey bars (高低杠). When it was my turn, I    50   my head. Some kids    51  . I went home crying.

After work the next afternoon, Mom took me to the school play-ground.

“Now, pull up with your right arm,” she advised. She stood by as I practiced, and she    52    me when I made progress.

I’ll never forget the    53   time I was crossing the bars. The kids were standing there with their mouths open.

It was the way with everything. When I    54   I can’t handle (处理) things, I see Mom’s smile again. She had the heart to    55   anything. And she taught me I could, too.   

41. A. missing               B. broken                 C. diseased            D. short

42. A. warning                B. medicine             C. help                 D. advice

43. A. badly                 B. differently         C. well                  D. normally

44. A. did                      B. refused          C. cried               D. was

45. A. find out                B. work out             C. carry out          D. help out

46. A. kitchen              B. bedroom        C. house               D. school

47. A. idea                   B. change               C. excuse               D. tool

48. A. chance               B. way                 C. time                 D. success

49. A. enough              B. too                  C. again               D. often

50. A. hurt                   B. nodded             C. shook               D. turned

51. A. cheered               B. whispered          C. joked               D. laughed

52. A. helped               B. raised               C. praised              D. protected

53. A. first                    B. last                  C. wondered         D. next

54. A. admit                B. fear                 C. find                 D. realize

55. A. face                   B. teach                C. learn                D. solve

企业营业执照的颁发部门是（）。

A．人民法院 

B．工商行政管理部门 

C．街道办事处 

D．税务部门

“一炮三检”指（）、爆破前和爆破后都要检查瓦斯浓度。

A.装药时

B.装药前

C.爆破时

D.装药后

关于MD5的说法正确的是（）。

A、MD5是单向hash函数

B、增加web安全账户的一个常用手段就是将管理员的用户密码信息，经过md5运算后，在数据库中存储密码的hash值

C、web数据库中存储的密码经过hash之后，攻击者即使看到hash的密码也无法用该信息直接登录，还需要进一步破解

D、目前攻击者在得到经过hash的用户名密码之后，最常用的破解手段是暴力破解