Parents often wonder what effects sucking a thumb 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 kids stop sucking their thumbs by the age of four.If it continues，the group advises parents to talk to their child’s dentist or doctor.It could influence the correct development of permanent teeth.

　　16．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

　　17．All the following statements are good to teeth except that ________.

　　A．children live on breast milk every day

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

　　C．children use fluoride toothpaste to brush their teeth

　　D．children form the habit of sucking their thumbs

　　18．The underlined word “supervised” in the fifth paragraph means “________”．

　　A．watched and directed

　　B．taught and helped

　　C．praised and advisedD．led and pointed out

　　19．Which one of the followings is NOT true according to this passage?

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