Bad teeth can be painful—and worse. They can even be deadly. Infections of t

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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. [br] What can be inferred from the example in the first paragraph?

选项 A、Many children died of tooth infection in 2007.
B、Tooth infection may cause children in danger too.
C、Tooth infection will spread to children’s brain.
D、Children need receive dental care at the age of 12.

答案 B

解析推理判断题。根据原文“成年人不是唯一处于危险之中的人群。例如，2007年华盛顿的医生说，一个男孩因牙齿感染扩散到脑部而丧生”，可推测牙齿感染也会危及儿童，B)含义与之吻合，故为答案。原文并未提及2007年许多孩子死于牙齿感染，故排除A)；原文仅举例说一个男孩牙齿感染扩散到脑部，不能推出儿童牙齿感染一定会扩散到脑部，故排除C)；D)是对原文意思的杂糅，故排除。

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