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◦인문과학
○다음 글을 읽고 물음에 답하시오. 
   This mind-body effect should not be surprising in view of the experience over the years with placebos. The term "placebo" is used to describe a "pill" that contains no medical ingredients but that often produces the same effect as genuine medication. Placebos provide ample proof that expectations can have an effect on body chemistry. According to a recent article on placebos in Medical World News, studies conducted over the past 25 years have shown that placebos satisfactorily relieved symptoms in an average of 35 percent of patients tested. These symptoms include; fever, severe postoperative pain, anginal pain, headache, and anxiety, among other complaints. The explanation for this strange phenomenon is that the human mind can create actual changes in body chemistry as a result of what it believes. If, for example, a person believes that a certain medication contains a substance that can accomplish a specific need, the body tends to move in that direction.
   An increasing number of scientists now contend that the body's healing system and its belief system are closely related. That is why hope, faith, and the will to live can be vital factors in the war against disease. The belief system converts positive expectations into plus factors in any contest against illness.

○질문 1.  
  placebo는 무엇을 의미하는지 말하시오.