| http://www.w3.org/ns/prov#value | - Second-graders Ella Russell, left, Fae Butler, center, and Ingrid Soracco giggle while looking at Ingrid's iPad book report at Jamestown Elementary School on May 13 in Arlington. (Ricky Carioti/The Washington Post) The rush for schools to buy tablets and other computers comes ahead of a looming deadline for new online standardized tests, scheduled to be introduced next year in 45 states and the Di
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