填空题

Sophisticated______techniques have been already employed to calculate how intermarriage is changing the face of the United States.

【参考答案】

mathematical modeling
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The racial and ethnic intermixing in this country is sometimes gradual and sometimes accelerated in history.
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There’s little agreement on what intermarriage will mean for U.S. society in the future as there is a lack of official numbers, a heightened tension surrounding racial issues, and the mutual suspicion that exists among different racial groups .
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