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单选题
The glands and organs mentioned in paragraph 3 are categorized according to _____.
A
whether scientists understand their function
B
how frequently they release hormones into the body
C
whether the hormones they secrete influence the aging process
D
whether they secrete chemicals into the blood
参考答案
参考解析
解析：
此题可用排除法。答案应定位在第三段。A选项中提到的scientists, function在第三段中都从未出现过，所以为无关选项，排除。B选项中提到frequently，而分泌荷尔蒙的频率在此段中也未提到，排除。C选项中的aging process在此段中也没有出现，排除。因此，此题应选D选项。
此题可用排除法。答案应定位在第三段。A选项中提到的scientists, function在第三段中都从未出现过，所以为无关选项，排除。B选项中提到frequently，而分泌荷尔蒙的频率在此段中也未提到，排除。C选项中的aging process在此段中也没有出现，排除。因此，此题应选D选项。
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