In all events, it is becoming clearer that the factors influencing our lifespan(寿命) are far more complex than had been previously thought.It now appears that if you wish to live a long life, it isn't simply a matter of eating the right foods, not smoking, driving with care, etc.You must also have the right attitude.Scientists found that people with a suspicious or mistrustful nature die far more often than people with a sunny character.Looking on the bright side, it seems, can add years to your life span.

　　()1.What

　　social scientists have long felt puzzled about is why________.

　　A．the mortality rate can not be predicted

　　B．the death number remained stable year after year

　　C．a fixed number for each type of death has not come into being

　　D．people lost their lives every year for this or that reason

　　()2.In his research, Gerald Wilde finds that technological advances and increases in safety standards________.

　　A．have helped solve the problem of so high death rate

　　B．have accounted for mortality rates in the past century

　　C．have reduced mortality rates for violent and accidental deaths

　　D．have achieved no effect in bringing down the number of deaths

　　()3.According to the theory of “risk homeostasis”， some traffic accidents result from________.

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