如图所示，用动滑轮把重为40N的物体匀速上提，弹簧测力计示数为24N，则拉力为

在果蝇细胞中，由G、C、U3种碱基构成的核苷酸共有X种，其DNA分子结构稳定性最低的时期是细胞周期的Y期，DNA分子复制出的2个分子彼此分离发生在Z期，则X、Y、Z分别是[ ]

A．5；分裂间期；有丝分裂后期和减数第一次后期

B．6；分裂前期；有丝分裂后期和减数第一次后期

C．5；分裂间期；有丝分裂后期和减数第二次后期

D．3；分裂后期；有丝分裂后期和减数第二次后期

第二部分：完形填空（共20小题，每小题1分，满分20分）

阅读下面短文，掌握其大意，然后从每题所给的四个选项（A、B、C、D）中，选出最佳选项。

For my daughter’s 19th birthday, we bought her tickets to go and see Linkin Park, as they were playing in our city. We didn’t really have the   41   but we knew how much this band meant to her.

The night before she was like a   42   at Christmas. Every so often she got up and came to   43   with us, because she couldn’t   44  . On the night of the   45   it was good to see her so   46   and excited, as she and her boyfirend set off.

Needless to say when they   47   after midnight, with T-shirts and lots of pictures of the band,   48   her telling about how fantastic they had been, we knew the money had been well   49  . This will be a memory she would   50   forget, and nor would we.

51   full of excitement from the night before, the following day they   52   to go shopping on the other side of the city. My husband and I   53  , loving the fact that she had not   54   that quality as she grew up.

Later that day they returned, with faces full of happiness and warmth. They presented my husband and me with a   55   each. On each present were the words “Because you are the   56   mum / dad in the world”. When we said our thank-yous and told her she didn’t have to, we asked her   57   she had bought us gifts. Her   58   was simply “Just because I love you”.

This wasn’t something   59   from our daughter; she had always given us a gift when she wanted to express her   60  , and each gift was always a welcome surprise. It could have been anything, it wouldn’t have mattered, and it was the act itself and the feelings behind it.

41. A. money                B. time                         C. interest                            D. news

42. A. worker               B. baby                        C. kid                                 D. parent

43. A. dance                 B. learn                       C.walk                                D. sit

44. A. speak                  B. sleep                        C. stand                               D. leave

45. A. concert               B. holiday                    C. party                               D. travel

46. A. healthy               B. happy                      C. pretty                              D. surprised

47. A. stayed                 B. left                          C. returned                          D. turned

48. A. worrying about    B. caring for                C. looking at                        D. listening to

49. A. lent                    B. earned                      C. saved                              D. spent

50. A. ever                   B. never                       C. often                               D. neither

51. A. Still                   B. Only                        C. Just                                D. Also

52. A. continued            B. tried                        C. decided                           D. struggled

53. A. refused               B. cried                        C. shouted                           D. laughed

54. A. kept                   B. lost                          C. realized                           D. discovered

55. A. gift                       B. prize                        C. ticket                              D. picture

56. A. richest                B. oldest                       C. best                                D. cleverest

57. A. where                 B. how                         C. when                              D. why

58. A. way                    B. answer                            C. suggestion                       D. idea

59. A. important            B. ordinary                   C. new                                D. valuable

60. A. feelings                     B. concerns                   C. understandings                 D. opinions    

横纹肌肉瘤病理分型哪一型预后最好（）

A.胚胎型

B.小泡叶型

C.多型性

D.上皮型

E.间叶型

烟煤粉仓为何要安装一氧化碳浓度监测报警装置？

甲于1990年10月因犯诈骗罪被判处无期徒刑，2004年3月被假释。2006年5月，甲通过互联网得知某单位有钢材销售后，与乙商量，要乙扮作自己的助理，携带款项前往洽谈生意。在甲与该单位谈判中，乙一直在场。经谈判，双方签订合同，合同约定，甲预付货款总金额30%后，可提走合同项下全部钢材，余款待甲提走货物后一星期内支付。甲按合同支付了15万元预付款，提走了价值50万元的钢材。钢材到手后，甲、乙与丙谈判销售钢材，丙对钢材来路表示怀疑，甲不得不说出实情。最终，丙支付30万元现金买下了该批钢材。甲分给乙3万元后潜逃。案发后，乙被抓获，主动提供了甲的藏匿地点，使公安机关顺利将甲抓获归案。
阅读、分析案情后，请回答下列问题：

请分别认定甲、乙、丙行为的性质。