如图，小球用两根细线悬挂，L₁与竖直方向成θ角，L₂水平。若保持L₂水平，使θ角增大，下列说法中正确的是

A．L₁、L₂拉力都不变

B．L₁、L₂拉力都增大

C．L₁的拉力不变、L₂拉力增大

D．L₁的拉力增大、L₂拉力不变

Many people are        the countryside        the cities.

A．moveing from, to

B．moving from , to

C．move to, from

D．move to , from to