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 advised

　　D．led and pointed out

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

　　A．Dental care should be given to babies as soon as they are born.

　　B．Special toothbrushes should be used for babies.

　　C．Breast milk and fluoride are helpful to protect baby teeth.

　　D．Dental experts suggest stopping babies sucking their thumbs.

　　20．The best title of this passage is ________.

　　A．The reason of a twelve­year­old boy’s death

　　B．Baby teeth should be cared for from birth

　　C．Breast milk and fluoride are important

　　D．How to help young children form good habitsB

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