When people become aging, they will lose some of their ability to bounce back from disease and injury, "bounce back" here means

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问题 When people become aging, they will lose some of their ability to bounce back from disease and injury, "bounce back" here means ______.
This passage is mainly concerned with ______.

选项 A、man’s aging process
B、man’s life span
C、man’s health
D、man’s medical care

答案A

解析 本题的关键是找到主题句,确定短文的中心思想。一般而言,主题句是文章的第一个句子。此题的正确选项是A,符合主题句的意思。其他的选项都是本短文的细节信息。
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