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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.
Which of the following is true according to this passage?
选项 A、The illegal immigrants always outnumber the legal ones in the U. S.
B、The legal immigrants always outnumber the illegal ones in the U.S.
C、There are about 8.5 million illegal immigrants in the U. S.
D、Most illegal immigrants come from Latin America.
答案D
解析 事实细节题。本题需综合全文来解题。A和B的说法都过于绝对，也与实际情况不符，因为过去几年进入美国的非法移民人数要多于合法移民人数，而现在则恰恰相反，合法移民人数超过了非法移民人数，可排除A和B；第五段明确提到美国的非法移民大约有1200万人，排除C；根据第七段最后一句中的“非法移民中有五分之四都来自拉丁美洲”，从而判断D正确。
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