Youmayhaveheardadultssaytheyareuncomfortableinthemornin...
問題詳情：Youmayhaveheardadultssaytheyareuncomfortableinthemorningwithoutacupofcoffee.Onereasontheymayfeelthatwayisthatcoffeecontainscaffeine(咖啡因).Caffeineappearsnaturallyincoffee,tea,andcocoabeans,w...