Chinese government is poised to conduct its first nationalsurvey of pollution sources in February to help control environmental deterioration in the country.
中国政府准备在2月份进行首次全国污染源调查，以帮助控制环境恶化。
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A case in point is the study by Linda Sax at UCLA, who used data from a large nationalsurvey of college freshmen to evaluate the effect of single-sex versus coeducational high schools.