The US may so far have enjoyed good luck in escaping a direct SARS hit, but officials aren’t leaving anything to chance. The bes

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问题     The US may so far have enjoyed good luck in escaping a direct SARS hit, but officials aren’t leaving anything to chance. The best hope for averting a SARS epidemic at home will be to keep SARS out at the nation’s borders.
    Federal immigration laws authorize immigration authorities to exclude non-citizens who are determined to have a "communicable disease of public health significance". Immigration law also authorizes the President by proclamation to suspend the entry of any group of aliens whose entry he deems to be detrimental to the interests of the United States. This little-used power could be deployed to exclude all aliens from affected areas, a policy Taiwan has recently implemented.
    Under the Public Health Service Act, any individual(citizens included)may be quarantined at an international port of entry if they are reasonably believed to be carrying a designated communicable disease. As of an April 4 Executive Order by President Bush, SARS is now a designated disease.
    Thus, in tandem with airline screening, federal health authorities are carefully monitoring travelers from affected areas in Asia for SARS symptoms. With an estimated 25,000 individuals entering the country legally from Asia on a daily basis, that is a tall order. A single SARS-infected person getting through the net could bring down the border strategy.
    The US government might also front-end the border strategy through restrictions on travel by American citizens to affected areas. In a series of Cold War era decisions, the Supreme Court upheld international travel restrictions for national security reasons, and one can imagine the same rationale applying to a public health emergency. How practical it would be to prohibit — and police — a travel ban to countries such as China is another question.
    The initial SARS defense, then, hinges on effective border control. But US borders are far from under control. There are an estimated 8-9 million undocumented aliens now in the United States, a figure growing by as many as 500,000 per year. Asia is the largest contributor to undocumented immigration outside the western hemisphere, tunneling illegal aliens into the United States through elaborate smuggling networks. SARS could just as easily make serious inroads into the US through this backdoor rather than the front.
From the first three paragraphs, we learn that ______.

选项 A、American officials don’t 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 US
D、immigration officers are empowered to keep aliens out of the US

答案C

解析 这是一道细节题。根据文章第2段首句可知,“患有传染性疾病的外国人,移民局可不让其入境”,所以C项应为正确答案。由于文章强调“传染性”是拒绝入境的前提条件,故B项“病人要隔离”过于夸大。A项与D项显然与文中意思不符。
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