The concept of personal choice concerning health is important because ______ . Sound personal health choice is often difficult

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问题 The concept of personal choice concerning health is important because ______ .
Sound personal health choice is often difficult to make because ______ .

选项 A、current medical knowledge is still insufficient
B、there are many factors influencing our decisions
C、few people are willing to trade the quality of life for the quantity of life
D、people are usually influenced by the behavior of their friends

答案B

解析 根据最后一段的第一句话及第一段第二句,A与文中的内容不符;D是一个原因但不全面,只有B才是正确、全面的原因。而C中所述文中未提及。
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