Democrats yesterday killed a Republican bill giving parents broad authority over their children’s school curriculum and medical treatment. The measure would have allowed parents to exempt their children from “any learning material or activity.” Republican sponsors have called it a needed check on government. The bill passed the Senate last month. But Democrats control the House and say the measure goes too far. Thy say it limits schools from providing non-emergency medical care without a parent’s permission. Democrats say that’s a recipe for hiding child abuse.