题目

— Did you know any Chinese, Joyce, before you arrived in Beijing?     — In fact, never _______ it. A. have I learned                 B. I have learned    C. had I learned D. I had learned   答案：C考查倒装句及时态，never _______ it是一个以否定词开头的倒装结构。  阅读图文材料，完成下列问题。河西走廊位于青藏高原与内蒙古高原之间，南以祁连山和阿尔金山为界，北至马鬃山、合黎山和龙首山，东起乌鞘岭，西迄甘肃与新疆交界。大部分地区海拔为1000—2500 m。河西走廊曾经是富饶的丝绸之路黄金段。河西走廊还是个“聚宝盆”，有丰富的矿产资源，油气储量也很丰富。下图为河西走廊示意图。（1）分析河西走廊成为我国古丝绸之路黄金段的原因。（2）试评价河西走廊油气资源开发的条件。