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  3. Living is risky. Crossing the road, driving a car, flying, swallowing an aspirin tablet or eating a chicken sandwich they can a

Living is risky. Crossing the road, driving a car, flying, swallowing an aspirin tablet or eating a chicken sandwich they can a

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问题     Living is risky. Crossing the road, driving a car, flying, swallowing
an aspirin tablet or eating a chicken sandwich they can all be fatal. Clearly
some risks worth taking, especially when the rewards are high: a man surrounded
【M1】______
by flames and smoke generally considers that jumping out of a
second-floor window is an acceptable risk to save its life. But in medicine【M2】______
a few procedures, drugs, operations or tests are really a matter of life and【M3】______
death. There may be sound medicine reasons for accepting electrical【M4】______
shock treatment, but such reasons are totally dependent in the balance of【M5】______
risks and benefits for the patients.
    Surgery for cancer may cure or prolong a life, but the removal of
tonsils(扁桃体)cannot save anything a sore throat. Blood pressure drugs【M6】______
definitely help some people live after a heart attack, but these same drugs
may be both necessary and harmful for those with only mild blood pressure【M7】______
problems.
    Deciding how much discomfort and risk we are preparing to put up【M8】______
with in the name of better health is a high personal matter, not a decision【M9】______
we should remain to doctors alone.【M10】______
【M7】
选项
答案根据上下文，应将necessary改成unnecessary．
解析
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