题目

我国地势西高东低，呈三级阶梯。下列地形区中，位于第一级阶梯的是 A．青藏高原      B．内蒙古高原     C．四川盆地        D．长江中下游平原 答案：A8. I found ___________difficult _________  English movies because I can't understand what they say.A. it; to watch          B. it; watchingC. it's; watch          D. it's; watching