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  3. Bad teeth can be painful—and worse. They can even be deadly. Infections of the gums and teeth can release bacteria into the bloo

Bad teeth can be painful—and worse. They can even be deadly. Infections of the gums and teeth can release bacteria into the bloo

admin2013-03-11  43
问题     Bad teeth can be painful—and worse. They can even be deadly. Infections of the gums and teeth can release bacteria into the blood system. Those bacteria can increase the chances of a heart attack or stroke and worsen the effects of other diseases. And adults are not the only ones at risk. For example, in 2007, 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. Experts say if you decide to put your baby to sleep with a bottle, only give the child 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 (氟化物) 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 hard surface on teeth, to help prevent holes 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 pea, should be used.
    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.
    Dentists say children should have their first dental visit at least by the time they are one year old. They say babies should be examined when their first teeth appear—usually at around six months.
According to the passage, what is the function of fluoride?
选项 A、Working well with toothbrush.
B、Making drinking water more tasty.
C、Making teeth surface harder.
D、Preventing holes on teeth from forming.
答案D
解析 事实细节题。根据定位句，氟化物与牙齿坚硬的表面结合，防止牙洞形成，D)含义与之吻合，故为答案。原文未提及氟化物与牙刷的相互作用，故排除A)；原文指出世界上许多地方使用氟化物保护牙齿，将其加入饮用水中，但未说氟化物加入饮用水中后会使味道更佳，故排除B)；C)杂糅原文意思，故排除。
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大学英语四级

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