题目

地坦荡荡,平沙无际;风吹草低,黄羊成群描述的是(      ) A、青藏高原              B、内蒙古高原         C、云贵高原              D、黄土高原 答案:BThere is a big dog____ to a fence outside the house. A. tying.                  B. tied.                           C. to tie.                            D. ties.
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