【正确答案】
A
【答案解析】[听力原文] Bad teeth can be painfu1—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. Last week, a twelve-year-old boy in the Washington area died when a tooth infection spread to his brain. Doctors said it might have been prevented had he received the dental care he needed. 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 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, only give the child water. What is not the symptom resulting from bad teeth? 根据选项特征推断本题可能考查某种病的症状。新闻第一句提到，坏牙齿会很疼。接着提到，牙龈和牙齿的感染会向血液系统中释放细菌，这些细菌会增加心脏病发作或中风的风险。由此可知，坏牙齿可能会导致牙疼、心脏病发作或中风，故答案为A。