若△ABC与△DEF相似，∠A=50°，∠B=70°，∠D=60°，则∠E的度数可以是[ ]
A.50°
B.70°
C.60°
D.50°或70°
答案：D
They all wanted to be teachers at that time, but _____ are teachers now. [ ]
A. none
B. none of them
C. no one
D. both
工程项目人员吸纳的基本方法不包括______。
A．商谈 B．预安排C．招聘 D．培训
