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American Illegal Immigrant Number Descends Illegal immigration, which has sparked political and social disorder in communiti

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问题                 American Illegal Immigrant Number Descends
    Illegal immigration, which has sparked political and social disorder in communities across the nation, is on the wane, according to an independent report released Thursday.
    The number of illegal immigrants entering the United States has slowed significantly the past few years, falling below the number of those entering the country legally, according to the report by the Pew Hispanic Center, a Washington think. The report estimates there were 11.9 million illegal immigrants in the U. S. as of March. That would be a decline of 500, 000 from the center’s estimate a year ago. However, the change was not statistically significant because of the margins of error. The Pew study does not address why the decrease occurred, but other researchers cite the nation’s struggling economy and stepped up enforcement of immigration laws.
    "The decline in job prospects in construction, service and other low-skilled jobs are communicated through extended networks of would be movers from Mexico and Latin America," said William Frey, a demographer at the Brookings Institution, another Washington think tank. "It also may propel more return migration."
    Census data released last month showed that overall immigration slowed dramatically in 2007, though the Census Bureau does not distinguish between legal and illegal immigrants.
    Illegal immigrants are notoriously difficult to count. Many researchers, including the federal government, estimate there are about 12 million illegal immigrants in the U.S.
    That’s a big increase from the start of the decade, when the Pew Hispanic Center estimated there were about 8.5 million. From 2000 to 2004, about 800,000 illegal immigrants a year entered the U.S. , the Pew port estimates. Since then, the average has dropped to about 500,000 a year.
    A decade ago, the number of newly arrived illegal immigrants began to outnumber those legally, entering the country, said the report, written by the Pew Hispanic Center’s senior demographer, Jeffrey Pas-sel, and senior writer, D’Vera Cohn. "The reverse now appears to be true," the report said. Illegal immigrants make up about 30 percent of all immigrants, according to the report. About four in five come from Latin America, with most coming from Mexico.
    Congress has passed several measures designed to increase border enforcement, and the Bush administration has stepped up raids on businesses. Some local communities have also passed ordinances to address the issue. Congress, however, has failed to pass a comprehensive package addressing illegal immigration, despite several attempts.
From the first two paragraphs, we can estimate______.
选项 A、illegal immigration has a serious social problem in the U. S.
B、the Pew Hispanic Center could not give the reason for the decline of illegal immigration
C、the statistics of illegal immigration is not significant
D、the political and social disorder in the U. S. is on the wane
答案A
解析 推理判断题。文章第一句就提到非法移民曾经在全国各地引发政治和社会动乱，因此它长期以来都是美国一个比较严峻的社会问题，由此可知A正确。文中说到皮尤西班牙裔研究中心没有对原因加以解释，但是并非无法解释，故B“皮尤西班牙裔研究中心无法解释非法移民人数为何下降”错误；文中说the change was not statistically significant，指的是从统计学上来说这一变化并不重要，因为非法移民的人数由于种种因素往往很难加以统计，不过这并非指对非法移民的统计不重要，故C“非法移民的统计并不重要”错误；本文提到引起政治和社会动乱的非法移民的问题正在消退，不是说动乱正在消退，D偷换了概念。
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