智者运动、文艺复兴、启蒙运动被称为西方思想史三大思想解放运动。下列对三者共同点是( )①提倡科学,反对迷信 ②肯定人的价值和尊严③反对封建束缚 ④促进人性的解放
A:①②
B:①④
C:①③
D:②④
解方程组 3x-2y=-1x+3y=7
判断.
圆的周长总是半径的π倍.
Tourists were feasting their eyes on the ocean scenery and suddenly they spotted an Iceberg (冰山)f____at a distance.