The author narrates the story in a ______ tone.

A．valuable because they provide a picture of the ways the mind works in perceiving word symbols
B．worthless because eye movements have nothing to do with skillful reading
C．worthless because they tell us little about how expert readers' functions are
D．valuable because they tell us much about the way the eye is put together

A．The body.
B．The eyes themselves.
C．The hand.
D．The min