I believe Mars soon in the future by human beings.
A:maybe visit
B:will be visited
C:may visit
D:can visit
如图,在平面直角坐标系中,点A(2,n),B(m,n)(m>2),D(p,q)(q<n),点B,D在直线y=12x+1上.四边形ABCD的对角线AC,BD相交于点E,且AB∥CD,CD=4,BE=DE,△AEB的面积是2.
求证:四边形ABCD是矩形.
既能用排水法,又能用向上排空气法收集的气体是( )
下列关于法国的叙述,不正确的是( )