The word "carcinogenic" means most nearly the same as（）

单项选择题Seeing and perceiving are （）

A．the same action
B．two separate actions
C．two actions carried on entirely by eyes
D．several actions that take place at different times

单项选择题The best title for this selection is（）.

A．How We See
B．Leaning about Our Minds through Science
C．What Psychologists Perceive
D．How to Become an Experimental Psychologist