More and more couples would rather ___ a second baby ____ their first child can feel less lonely.
A:have; in order to
B:to have; in order to
C:have; so that
D:to have; so that
斜面坡度越小,所需的拉力越____。即坡度越小越____。
下列表示北京地理位置的是( )
你使用的物理新课本从桌面滑落到地面上,估计重力对课本所做的功最接近( )