队列研究中最常见的偏倚是（）。
A.入院率偏倚
B.回忆偏倚
C.报告偏倚
D.失访偏倚
E.无应答偏倚
参考答案：D
---I’ll thank you my affairs alone.
---I will. It’s none of my business.
A．leaving
B．to leave
C．for leaving
D．not to leave
Put some _____ and chicken _____ on the sandwich.
A. lettuce, slice
B. lettuces, slices
C. lettuce, slices
D. lettuces, slice
