在图甲、乙、丙、丁四村中,优先发展为城市的是( )
时针走一圈经过的时间是12小时.
Mike didn't get wet because his teacher _______ him an umbrella.
如图所示,△ABC中,AB=AC,过AC上一点作DE⊥AC,EF⊥BC,若∠BDE=140°,则∠DEF=( )