How many students were shot dead in 1997 in US schools（）

A．There are about 10 percent disabled persons in the UK.
B．The whole society should pay attention to the barriers faced by the disabled people.
C．Even the able-bodied may lose some of their body functions when they get older.
D．There still exists prejudice against the disabled which results mainly from ignoranc

A．your friends is too busy to read a letter
B．your friend hates to receive a letter
C．your friend is not worthy of your letter
D．your friend should not have written you a letter