A:今老矣,无能为也已
B:已行,非弗思也
C:鞠躬尽瘁,死而后已
D:可以已大风
There must have been some ____ (understand). I didn't order all these books.
9.56×8=____
下图示意我国某地等高线(单位:米),图中每个正方形网格的实地面积为4平方千米。读图,完成下面小题。