C．Not all American students have the chance to study abroad.　

　　D．The presence of foreign students helps the UN.

　　解析：选C　推理判断题。根据倒数第三段Rajika Bhandari所讲的话中“those American students who may never have the opportunity to study overseas”可知，这些美国学生也许不会有机会去海外留学，由此可推知，并非所有的美国学生都有机会去留学。故C项正确。

　　12．Foreign students in American schools help the U．S.economy mainly by ________.

　　A．trading with American citizens

　　B．taking part­time jobs

　　C．providing international exposure

　　D．paying for tuition and housing

　　解析：选D　细节理解题。根据倒数第二段Evan Ryan所说的话中“students from abroad also adds to the U．S.economy through payments for tuition, housing and other costs”可知，留学生通过支付学费、房租及其他消费促进了美国经济的增长。故D项正确。

　　D

　　(2016·平顶山第一次模拟)A restaurant in Tokyo has announced that it will refuse to serve couples on Christmas Eve because their happiness would serve to remind single members of staff of their loneliness. The owner of PiaPia, the restaurant in Tokyo, has placed a handwritten sign in the window of the restaurant that reads, “We will be refusing entry to all couples on December 24, with no exception！”

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