大多数人都会认为对自己有足够的了解，但许多错误的职业生涯抉择就是因为对自己认识不清做出的。
参考答案：对
Sarah had her washing machine repaired the day before yesterday, ____ she?
[ ]
A. had
B. did
C. hadn't
D. didn't
直角三角形ABC的斜边AB=13厘米，直角边AC=5厘米，把AC对折到AB上去与斜边相重合，点C与点E重合，折痕为AD(如图)，则图中阴影部分的面积为( )平方厘米.
