The amount of stress a person can withstand depends very much on the individual．Some people are not afraid of stress，and such characters are obviously prime material for managerial responsibilities．Others lose heart at the first sight of unusual difficulties．When exposed to stress，in whatever form，we react both chemically and physically．In fact we make a choice between “fight” or “fright” and in more primitive days the choice made the difference between life and death．The crisis we meet today are unlikely to be so extreme，but however little the stress，it involves the same response．All the energy is shifted to cope with the stress．It is when such a reaction lasts long，through continued exposure to stress，that health becomes endangered．Such serious conditions as high blood pressure and heart disease have established links with stress．

　　Stress in some people produces stomach disorders，while others experience tension headaches．Since we cannot remove stress from our 1ires，We need to find ways to cope with it．

　　51．People are finding less and less time for relaxing themselves because

　　.

　　A．they are working harder than they used to

　　B．they are often too busy to find the time

　　C．they are not clear of how to relax by themselves

　　D．they are suffering from the effects of stress

　　52．What is implied but not stated in the passage?

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