下列命题中,有几个真命题 ( )
①同位角相等 ②直角三角形的两个锐角互余 ③平行四边形的对角线互相平分且相等 ④对顶角相等
A:1个
B:2个
C:3个
D:4个
get, smell, seem, look, feel, go, sound, become, taste, turn