读某地等高线图，回答下列问题．

（1）图中A、B两处，适合攀岩的是______处；适合漂流的是______处．①河段小河的流向大致为______．

（2）图上测得甲、乙两地的直线距离约为1厘米，若要在两地间修建缆车，则缆车线路长度至少______米．

（3）判断图中C、D两山坡更适合修梯田的是______坡．

Whenever I met him, ____ was fairly often, I like his sweet and hopeful smile.

A．what

B．that

C．which

D．when