A．The number of patients infected with HIV is relatively small.
B．Both HIV and lightning have already taken a heavy toll on life.
C．People who are infected with HIV are doomed to die.
D．Patients have a very low risk to catch HIV from doctors.

A．connects
B．equivalent
C．experiences
D．experiments
E．figure
F．gradually
G．heartfelt
H．immediately
I．leave
J．powerful
K．proving
L．reluctant
M．strength
N．suppose
O．tools