[解析]
(1)A 细节理解题.根据第二段最后一句"There,they're often greeted by long lines,followed by a face﹣to﹣face interview that can end badly in a matter of seconds."可知,在中国,申请美国签证,经常排着长队,一个挨一个去面试,几秒内就可能失败而归.故选A.
(2)B 推理判断题.根据第七段中的"Student visas can be refused on grounds of national security.Beijing native Tan Ge,25,believes he was not accepted after he stated his interests in infrared(红外线的)technology and nanoelectronics(纳米电子学)on his application."可知,学生签证可能以国家安全为由拒签.北京人谭格在陈述了自己对红外技术和纳电子学感兴趣后遭到拒签.因此推断他被拒签很可能是因为安全问题.故选B.
(3)C 推理判断题.通读最后四段可知,徐勇觉得签证过程令自己很不舒服,非常难堪,等待的每一分钟都令人坐立不安,签证通过以后他赶紧给妈妈打了电话,妈妈提醒过他签证不是一件容易的事情.再结合上文的几个例子可以推断,作者详细描述徐勇的签证经历是为了强调通过美国的签证是多么难.故选C.