最早构建的质粒载体是（）。A、pUC B、pBR322 C、pUR278 D、pGP

Whom do you want to have _____ the parts of a car together?[ ]

A. fix

B. to fix

C. fixing

D. fixed

具有磁性物体是()

A．镍

B．钴

C．铜

D．锌

E．钢

阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C、D）中，选出最佳选项，并在答题卡上将该项涂黑。（共20小题；每小题1.5分，满分30）

Have you just been fired? Don’t worry. Cheer yourself up and send your  36  . Perhaps another much better opportunity is awaiting you.  37   sometimes you don’t realize it, you are asking to be fired.

Dan Zawacki was a happy camper, selling computers for Honeywell. One holiday he was  38  creative gifts and then a good idea  39 him---- selling dinner live lobsters(龙虾) to his favorite customers. He  40  them himself with butter and put them in the trunk of his car between the computers and started delivering. It was a huge  41 . As a result, one of his customers   42  they go into the lobster business together. Dan laughed. Still, this landlocked computer salesman 43  get the idea of lobsters out of his  44  . Why not turn this into a hobby and  45  a few extra dollar? While on a job assignment in Chicago, he  46  a local radio station to give him a few ads in 47 for lobster. Unfortunately, his boss’s boss heard his prize salesman 48  lobster, not computers. No surprised. Dan was let go. After  49  the company’s car, he started to think maybe this was a  50 . Playing with his phone that night, Dan tried dialing 1-800-LIVE-LOB. The number was   51  , and Dan the lobsterman was born. Today, 20 years later, Dan is still selling dinners, through his company, Lobster Gram. And he couldn’t be  52 .

Many of the fired people found ways back to fulfilling   53  and learned the pain and humiliation(羞辱) are 54  . So do not be afraid to move  55   and try your wings. Gather your support system. Persevere! Firing doesn’t mean your life is over. It might turn out to be the best thing that ever happened to you.

36. A. dreams          B. wings               C. needs           D. minds

37. A. Because         B. When                C. Though          D. If

38. A. searching for   B. making up           C. giving away     D. thinking up

39. A. came about      B. took place          C. went on         D. came to

40. A. packaged        B. sold                C. tied            D. placed

41. A. matter          B. business            C. failure         D. success

42. A.said             B. thought             C. suggested       D. hoped

43. A. couldn’t       B. mustn’t            C. shouldn’t      D. wouldn’t

44. A. heart           B. mind                C. head            D. hand 

45. A. make            B. get                 C. gather          D. spend

46. A. permitted       B. hoped               C. persuaded       D. suggested

47. A. change         B. exchange            C. place           D. need

48. A. hunting         B. seeking             C. collecting      D. selling

49. A. selling     B. paying              C. returning       D. using

50. A. thing       B. sign                C. pity            D. please

51. A.wrong        B. right               C. free            D. available

52. A. happier     B. worse               C. lower           D. higher

53. A. jobs        B. wishes              C. careers         D. promises

54. A. short       B.long                C. forever         D. temporary（临时）

55. A. back        B. on                  C. in              D. away

下列哪个药物与甲氧苄胺嘧啶合用称为百炎净

A．磺胺嘧啶
B．甲氧苄啶
C．磺胺甲哑唑
D．百浪多息
E．磺胺噻唑

中枢神经系统白血病最常见于（）

A.急性粒细胞白血病

B.急性淋巴细胞白血病

C.急性单核细胞白血病

D.急性早幼粒细胞白血病

E.慢性粒细胞白血病