单选题：What does the experiment mentioned in paragraph 4 prove?____

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What does the experiment mentioned in paragraph 4 prove?__________ A．A There are more enzymes in decal drinkers' urine sampl
B．B there are more melatonin concentrations in caffeine drinkers' urine sampl
C．C Decal drinkers produce less melationi
D．D Caffeine drinkers produce less sleep hormon

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根据材料，回答题：On Halloween, children in the United States often d

根据材料，回答题：On Halloween, children in the United States often dress up as__________

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分类：卫生类题型：单选题