A:南极大陆
B:澳大利亚大陆
C:非洲大陆
D:亚欧大陆
已知集合A=x|y=-2x-x2,B=y|y=2x,x>0,R是实数集,则CRB∩A= ( )
The best way to learn new words is by _____ English magazines.