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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 this passage, we can learn that______.
选项 A、there would be no more political and social turmoil in the U.S. without illegal immigrants
B、the Washington government has two think tanks
C、the government is trying to solve the issue of illegal immigration
D、the U. S. Congress does not want to solve the issue of illegal immigration
答案C
解析 推理判断题。文中最后一段列举了试图解决非法移民问题的种种努力，可知C正确。虽然非法移民引发了很多政治和社会问题。但是并非是引发这些问题的唯一原因，故A错误；文中提到皮尤西班牙裔研究中心和布鲁金斯研究所都是华盛顿的智囊团，但是并没有指出仅仅只有这两个智囊团，故B不准确；文章结尾说到国会曾进行了多次尝试，但是由于种种原因，至今尚未提出完整的解决方案，但并非美国国会不想解决该问题，排除D。
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