填空题

Stress is a natural part of everyday life and there is no way to avoid it. In fact, it is not the bad thing as it is often (36) to be. A certain amount of stress is (37) to provide one with motivation and give (38) to life. It is only when the stress gets out of control that it can lead to poor (39) and ill health, The (40) of stress a person can withstand depends very much on the individual. Some people are not afraid of stress at all, and such (41) are obviously prime to material for managerial responsibilities. Others lose heart at the first signs of (42) difficulties. When exposed to stress, in whatever form, we (43) , both chemically and physically. In fact, we make a choice between "flight" and "fight". In more primitive days (44) . The crises we meet today are unlikely to be so extreme, but however little the stress is, it involves the same response. (45) . Such serious conditions as high blood pressure and heart disease have established links with stress. (46) .