The passage is mainly about ______. According to the passage, what is the relationship between blood testing and keeping health

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问题 The passage is mainly about ______.
According to the passage, what is the relationship between blood testing and keeping healthy?

选项 A、The information hidden in a drop of blood call keep one healthy.
B、To take blood testing is necessary for keeping healthy.
C、Blood testing can only avoid dangerous health conditions.
D、Blood testing is necessary only for the sick.

答案B

解析 细节题。文章最后一段作者用问答的形式说明了血液检测对健康的必要性:Was the stick...yes,其中的the stick in the finger or arm指的就是通过手指或者胳膊抽血进行血液检测,由此可知他认为血液检测对于保持健康是必要的。
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