Parents often wonder what effect thumb sucking or sucking on a pacifier might have on their baby’s teeth.Dental experts generally agree that this is fine early in life.

　　The American Academy of Family Physicians says most children stop sucking their thumb by the age of four.If it continues，the group advises parents to talk to their child’s dentist or doctor.It could interfere with the correct development of permanent teeth.

　　1．The boy with a bad tooth died because ________.

　　A．his tooth disease was very deadly

　　B．the doctor refused to treat him properly

　　C．he didn’t receive timely treatment

　　D．something was wrong with his brain

　　答案　C

　　解析　细节理解题。根据第一段中的“They said it might have been prevented had he received the dental care he needed.”可知，如果男孩得到及时的治疗的话，或许能阻止这种事情的发生。

　　2．All the following statements are good to the teeth except that________.

　　A．the children live on the breast milk every day

　　B．the children begin to brush their teeth when they are old enough

　　C．the children use fluoride toothpaste to brush their teeth

　　D．the children form the habit of sucking their thumbs

　　答案　B

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