图4为沿图3（相邻经线或纬线的间隔均为5°）某剖面线的地形剖面示意图。完成6～7题。

小题1:图4依据的剖面线是图3中的（　　）

A．L₁

B．L₂

C．L₃

D．L₄小题2:图4所示剖面两侧大致上是我国的（　　）

A．人口稠密区和人口稀疏区

B．半湿润和半干旱区

C．第二级阶梯和第三级阶梯

D．季风区和非季风区

I bought the train tickets at the station easily during the spring rush, though ________ of them ________ it.

A．nobody; expected

B．none; had expected

C．nobody; had expected

D．none; expected