A:横断山和秦岭
B:太行山和雪峰山
C:大巴山和巫山
D:祁连山和唐古拉山
If you are hunting ________ chance to improve yourself in English,I think the English corner will be ________ smart choice.( )
已知函数y=tanωx在(-π2,π2)内是减函数,则( )
400-119=____