题目内容:
What does the experiment mentioned in Paragraph 4 prove?
A.There are more enzymes in decal drinkers' urine sample. B.There are more melatonin concentrations in caffeine drinkers' urine sample.
C.Decaf drinkers produce less melatonin.
D.Caffeine drinkers produce less sleep hormone.
参考答案:
答案解析: