I read this on the National Institute for Early Education Research (NIEER)
Native speech key for preschoolers, study finds Date: Mar 22, 2007Source: The News & Observer, Raleigh, NC By: Staff Reports
A new study finds that Spanish-speaking preschoolers are better adjusted in class when their teachers speak at least some Spanish, compared to children whose teachers speak only English. The key finding of the study, by the Frank Porter Graham Child Development Institute at UNC Chapel Hill, tends of refute conventional wisdom that English-only pre-kindergarten programs help close achievement gaps among children from different racial, ethnic and socioeconomic groups.
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