An organization will select 20 blood donors from 100 applicants for physical examination
The least likely to be selected are those who have donated blood since 2000 or who have failed the blood donation physical examination since 2002
Xiao Liu signed up for blood donation in 2003, and because of the unqualified physical examination of Auskang positive, this time he issued a certificate of Auskang turning negative and insisted in donating blood