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OG29(CR)の解説の意味がわかりません。どなたか教えて下さい。
B)Bottled spring water has not been consumed in significantly different quantities by people diagnosed as having the intestinal disease, as compared to people who did not contract the disease.
So does B, which eliminates a factor that might have differentiated between those contracting and those not contracting the disease and thus rules out an alternative explanation.
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