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

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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             【S1】_____
high: a man surrounded 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 a few      【S2】_____
procedures, drugs, operations or tests are really a matter      【S3】_____
of life and death.. There may be sound medical
reasons for not ’accepting electrical shock treatment,          【S4】_____
but such reasons are totally dependent in the balance of        【S5】_____
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 drags        【S6】_____
definitely help some people live after a heart attack, but
these same drags may be both harmful and necessary              【S7】_____
for those with only mild blood pressure problems. Deciding
how much discomfort and risk we are preparing to put up         【S8】_____
with in the name of better health is a high personal matter,    【S9】_____
not a decision we should remain to doctors alone.               【S10】_____
【S7】

选项

答案necessary→unnecessary

解析 本句属于篇章理解错误。necessary and harmful产生矛盾,因而要把表示正面含义的necessary变成表示负面含义的unnecessary。
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