Test 4

　　Ⅰ.阅读理解

　　A

　　It might seem hard to imagine that a bad tooth could be deadly.But doctors in the Washington area said a boy died when a tooth infection spread to his brain.They said it might have been prevented had he received the dental care he needed.He was 12 years old.

　　Experts at the National Institutes of Health say good dental care starts at birth.Breast milk，they say，is the best food for the healthy development of teeth.Breast milk can help slow bacterial growth and acid production in the mouth.

　　But dentists say a baby’s gums and early teeth should be cleaned after each feeding.Use a cloth with a little warm water.Do the same if a baby is fed with a bottle.Experts say if you decide to put your baby to sleep with a bottle，give only water.

　　When baby teeth begin to appear，you can clean them with a wet toothbrush.Dentists say it is important to find soft toothbrushes made especially for babies and to use them very gently.

　　The use of fluoride(氯化物) to protect teeth is common in many parts of the world.For example，it is often added to drinking water supplies.The fluoride mixes with enamel (釉质)，the hard surface on teeth，to help prevent holes，or cavities，from forming.

　　But young children often swallow toothpaste when they brush.The American Academy of Pediatric Dentistry notes that swallowing fluoridated toothpaste can cause problems.So young children should be carefully supervised when they brush their teeth.And only a small amount of fluoridated toothpaste，the size of a green pea，should be used.

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