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killian killian
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10 years ago
Ulcers have historically been viewed as being psychosomatic illness.  However, recent research indicates that __________, not stress or diet is the major cause of peptic ulcers.
      a.    a virus
      b.    a bacterium
      c.     a prion
      d.     an abnormal protein formation in the blood
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Smiling Face with Open Mouth
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f_zah1f_zah1
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