The author states that the reason that infants need to avoid certain foods related to allergies has to do with the infant’s _. A.lack of teeth B.poor metabolism C.underdeveloped intestinal tract D.inability to swallow solid foods
Đáp án đúng: C Giải chi tiết:Sentence: "Many of these allergies will not develop if these foods are not fed to an infant until her or his intestines mature at around seven months." => not fully intestinal tract of infant, so it's difficult for infant to degest them.