5、 文意選填 20% 每題1分     The major causes of death in America today are heart attack and sudden injury. Most people have been, or will be, present when a victim of one of these sudden attacks waits 1._____ an ambulance. If the victim loses pulse and breathing, the chances for 2.______ decrease tremendously. Only 18 percent survive if no one can help the victim to maintain pulse and breathing 3.______an ambulance arrives.    If, 4.______, the victim receives vital aid within the first minute, there is a 98 percent chance for survival. As aid arrives later and later, these chances 5.______. After four minutes without a pulse, 6.______, the brain begins to deteriorate. If help is delayed for six minutes, the victim's chances decrease 7._____ 11 percent. It is vitally important that all of us understand the 8.______ to take when someone's pulse or breathing stops suddenly.     Of 9.______deaths, 50 percent are caused by choking. If a victim struggles to take air into his or her lungs, immediately check for blockage in the mouth or throat. Sometimes, a wheezing noise indicates that the airway is partially blocked, and the victim can't breathe normally. An absence of noise is 10.______ more serious, indicating a completely blocked airway, which may cause the victim's death very soon.

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