68．The second paragraph is mainly about________.

　　A．the cause of the effects of alcohol

　　B．unpleasant effects caused by alcohol

　　C．the advantages of drinking alcohol

　　D．Asians and alcohol

　　答案　B　[主旨大意题。第二段主要介绍了一些人喝酒后的不良反应，如脸红、胃不舒服、头痛等，故答案为B项。]

　　69．We can infer from the passage that________.

　　A．the ALDH2 deficiency may be passed on from generation to generation

　　B．about 36 percent of Japanese，Chinese and Koreans are heavy drinkers

　　C．unpleasant effects occur only when people with this deficiency drink a lot

　　D．only some East Asians have the ALDH2 deficiency

　　答案　A　[推理判断题。根据第三段The cause is a genetic difference that they are born with called an ALDH2 deficiency.可推断，答案为A项。 ]

　　70．Esophageal cancer is one of the deadliest cancers because________.

　　A．it can't be treated at all

　　B．it is hard to be discovered early

　　C．people are usually addicted to alcohol

　　D．it is hard to cure once it has developed

　　答案　D　[细节理解题。根据第五段．..but once it grows the chances of survival drop sharply可知，答案为D项。]

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