46. From the first three paragraphs, we learn that ____________________.

　　A. American officials dont see any chance of escaping an immediate SARS hit

　　B. non-citizens with a disease will be quarantined at the international airport

　　C. foreigners with a communicable disease may legally be denied entry into the U.S.

　　D. immigration officers are empowered to keep aliens out of the U.S.

　　47. Which of the following statements is true according to the text ?

　　A. The President rarely declares a rejection of non-citizens from infected areas.

　　B. The U.S. is the only lucky country to have kept safe from a SARS attack.

　　C. The interests of the U.S. are given more legal protection than public health.

　　D. The Public Health Service Act has been brought into effect since April 4.

　　48. The phrase a tall order most probably means _______________.

　　A. an ambitious plan B. a difficult task

　　C. a careful arrangement D. an illegal decision

　　49. The author would probably agree that ______________________.

　　A. a SARS hit could be escaped by means of strict monitoring of international travel

　　B. undocumented immigrants poses a serious threat to national security of U.S.

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