21．The most important thing for a foreign student to do is to ________．

　　A．show thankfulness to others when he/she gets help

　　B．always care about how to say “Thank you” to others

　　C．help others and try to get as much appreciation as possible

　　D．remember a “Thank you” is enough for all kinds of help

　　答案　A　[细节理解题。根据第二段中的most important is to remember to always express appreciation in one way or another可知，作为一个在美国的外国学生最重要的是在得到帮助时，不要忘记向别人表示感激之情。]

　　22．We may know from the passage that ________．

　　A．there is no need for “Thank you” between friends and close relationship

　　B．the further the relationship, the more formal the expression of gratitude needs to be

　　C．taking a “thank－you” note with you when you go to an American family for a meal

　　D．always taking gifts for all family members when you visit an American family

　　答案　B　[细节理解题。根据The closer the relationship, the less formal the expression of gratitude needs to be.可知B项正确。]

　　23．The underlined word “twobit” in the passage probably has the same meaning as ________．

　　A．cheap

　　B．expensive

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