填空：As the pace of life continues to increase, we are fast losing the art of relaxation. But relaxation is __1__ for a healthy mind and body. Stress is a natural part of everyday life and there is no way to __2__ it. In fact, it is not the bad thing as it is often supposed to be. A certain amount of stress is vital to provide motivation and give purpose to life. It is only when the stress gets out of __3__ that it can lead to poor performance and ill health. The amount of stress a person can withstand depends very much on the individual. Some peoplw are not afraid of stress, and such __4__ are obviously prime material for managerial responsibilities. Others lose heart at the first sight of __5__ difficulties. When exposed to stress, in whatever form, we react both physically and __6__. In fact we make choice between "flight or fight" and in more __7__ days the choices made the difference between life or death. The crises we meet today are unlikely to be so extreme, but however little the stress, it involves the same __8__. It is when such a reaction lasts long, through continued __9__ to stress, that health becomes endangered. Since we cannot __10__ stress from our lives it would be unwise to do so even if we could, we need to find ways to deal with it. A)exposure B)characters C)answer D)chemically E)avoid F)psychologically G)primitive H)transfer I)unusual J)control K)remove L)escape M)response N)backward O)essential