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試題(衛(wèi)生B) 

? ? ? .... cultures.  not mentioned

  17. wkman...results   right

  18.Americans....guines  not mentioned

  ........everywhere right

  20.Two.....thing   right

  ......change   nor mentioned

  22 people....other   right

  aph1.   E description...

  eph2.   C necessity...

  aph3.   D research...

  aph4.   F  factors..

  27.Techniques....   F improve..

  28there....   B show..

   ....  D affect..

   ....  E be specially...