C．They drive cars less and less.

　　D．They like walking and cycling.

　　答案　A　[推理判断题。根据倒数第二段第一句可知，美国在这项研究中排名第十二，说明在美国，使用“活跃的交通方式”的人并不多。 ]

　　D

　　Why do some people flush when they drink alcohol(酒)？This effect is a common reaction to alcohol among East Asians.It affects about 36 percent of Japanese，Chinese and Koreans.

　　For many，even a small amount of alcohol can cause unpleasant effects.Most commonly，their face，neck and sometimes their whole body turn red.People might also feel uncomfortable and sick to their stomach.They might experience a burning sensation，increased heart rate，shortness of breath and headaches.

　　The cause is a genetic difference that they are born with called an ALDH2 deficiency(缺乏)．It prevents their bodies from treating alcohol the way other people do.But the effects might be more serious than just a red face.Researchers warn of a link between this condition and an increased risk of cancer of the esophagus(食道) from drinking alcohol.

　　The more alcohol people with this deficiency drink，the greater their risk is.In Japan and South Korea，for example，many people have the deficiency but still drink heavily.Researchers found that these drinkers develop a form of esophageal cancer six to ten times more often than those without the deficiency.

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