The new lesson change; Primary school mathematics; Teaching; Method.

新课改；小学数学；教学；方法。

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"You just don't change a primary endpoint in a major important trial partway through, " says Bruce Psaty, a drug safety expert at the University of Washington.

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"Iowa is not going to be driven by the Republican Party in South Carolina making a change to their primary date, " said Carrie Giddins, communications director for the Iowa Democratic Party.

CNN: South Carolina GOP moves up primary, adds to 2008 scramble

All of these are counted in the U6 unemployment rate as also reported by the BLS. Because the primary change during the month was that 582, 000 on net shifted from unemployed to employed part time for economic reasons, this U6 unemployment rate remained unchanged last month at 14.7%.

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