A:x|-1<x<1
B:x|-2<x<1
C:x|-2<x<2
D:x|0<x<1
不能用于扑灭石油油井起火的方法是( )
下列现象中,由于光的直线传播而形成的是( )
It's good for your eyes to the green trees for a minute or two.
What's this?- It is a .