题目

读中国山脉分布示意图，完成下列填空． （1）写出下列数字代表的山脉名称：①_________，②_________． （2）③和⑩以_________山脉为界． （3）⑦是_________盆地，其南北两侧山脉分别是_________山和_________山． （4）我国第一、二级阶梯的界山号码是_________和_________． （5）④是_________省和_________省的界山． ——Isn’t it time you went to bed, Mike ? ——I ________ painting all afternoon, so I have to finish my homework now. A. was practicing       B. have practiced     C. have been practicing   D. had practiced