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36～55各题所给的四个选项（A、B、C和D）中，选出最佳选项。
Most of the foods we eat today were at one time or another not known to man. One by one they are   36 and became a part of our everyday  37  . Very often the person, who was the first to  38  these foods, however, had to be a person of  39  . Who, for 40  , ate the first crab（蟹）and who, the first mushroom？ 
When  41  and coffee were first introduced to  42  in the eighteenth century, there were many   43  for and against their use. Some people claimed（宣称）that they were   44  , and that, if drunk over long periods of time, they would kill  45  . In Sweden, King Gustav III decided to find out whether these  46  were true or false. It  47  happened that there were two brothers who were in  48  at the time；they were twins and were almost exactly alike in every 49  . They had also been sentenced to 50  . The King decided to let them live if one of them 51  to drink several cups of tea each day and the other, several cups of  52  each day. 
Both brothers lived many years without any 53  of any kind. At last one brother who  54   to drink tea every day died at the age of 74 and   55 died a few years later. Because of the way the experiment had turned out, Sweden is today one of the countries in the world where much tea and coffee are drunk. 
36. A. introduced    B. produced      C. added          D. changed
37. A. drink          B. cost         C. diet           D. interest
38. A. cook          B. discover      C. try            D. check
39. A. success       B. courage         C. practice        D. will
40. A. free         B. ever           C. long            D. example
41. A. tea           B. tobacco       C. milk            D. chocolate
42. A. America        B. Europe        C. Africa         D. England
43. A. attempts      B. decisions      C. opinions        D. advice
44. A. different     B. common             C. plants         D. poisonous
45. A. a person       B. themselves    C. others          D. ourselves
46. A. wishes        B. decisions      C. doubts        D. conversations
47. A. so            B. very              C. too              D. much
48. A. school         B. hospital        C. danger          D. prison
49. A. day            B. way            C. part          D. photograph
50. A. death         B. dead            C. die            D. dying
51. A. agreed        B. pleased         C. allowed        D. prepared
52. A. milk           B. water           C. coffee         D. orange
53. A. food            B. problems      C. taste           D. happiness
54. A. had           B. enjoyed         C. allowed        D. insisted
55. A. others        B. other           C. another         D. the other