I tried to call you _____ I heard from him, but you were not in. [ ]

A. since

B. while

C. until

D. as soon as

下图为我国北方某区与地貌景观和地质剖面示意图。读图回答1—2题。

1、下列土地整治方式中合理的是：①甲处平整土地，提高土地质量、②乙处修建护坡堤，防止岸坡侵蚀、③丙处修建梯田，增加耕地面积、④丁处修建挡土坝，拦截泥沙以淤地[ ]

A．①④

B．②③

C．③④

D．①②

2、图中I、II、III、IV处主要由内力作用形成的是[ ]

A．I、II

B．III、IV

C．I、III

D．II、IV