A：
B：
C：
D：
at accost of take root break down on display seek out
on board be tired of in place of serve as hold up
be responsible for return to normal
将图上1厘米代表实地距离2千米转换为数字式比例尺为____．
下图为我国某区域示意图。读图回答题。图中湖泊的最大水量一般出现在（ ）
