地跨寒、温、热三带的大洲有 ( )
①亚洲 ②欧洲 ③非洲 ④北美洲
A:①④
B:①②
C:②③
D:②④
已知点P(-1,3)在反比例函数y=kxk≠0的图象上,则k的值是 ( )
Parents should let their children make their own ____ (decide).