general purpose computer has four main comp onents: the ari thmetic、lopic、uni t(ALU), A 、the control unit.
the rnemory, and、the input and、output devices. The controlunit ， ALU, resgisters, and、（     ） are collectivellr known as A 、central processing unit(CPU)
A、bus
B、basiC I/0
C、chip
D、memory