AI: 81．“No one can possibly achieve any real and lasting success or ‘get rich’ in business by conforming to conventional practices or ways of thinking.”

AA: 43．“There is a common misconception that university hospitals are better than community or private hospitals. This notion is unfounded, however: the university hospitals in our region employ 15 percent fewer doctors, have a 20 percent lower success rate in treating patients, make far less overall profit, and pay their medical staff considerably less than do private hospitals. Furthermore, many doctors at university hospitals typically divide their time among teaching, conducting research, and treating patients. From this it seems clear that the quality of care at university hospitals is lower than that at other kinds of hospitals.”

1 一只老鼠从A出发，经过B、C到达D，只能向东或向北走，问有多少种走法

2 开一段路，一部分的平均速度是45，一部分的平均速度是65，问总共的平均速度

A.前一部分的开过的路程是总路程的36%
B.总路程是400mile
3. 一直線上面有 A, B, C, D 四點 (按順序排列), AB=4, BC=1 and BD=6, what is C D