A．Jack vacuumed the living room but not the bathroom.
B．Jack cleaned the bathroom but not the living room.
C．Jack cleaned neither the living room nor the bathroom because he is exhausted.
D．Jack cleaned both the living room and the bathroom.

A．To give an example that both human beings and animals can recognize faces.
B．To tell how a skilled writer could describe all the features of different people.
C．To indicate how pigeons and people look different.
D．To show how faces are like fingers.