单项选择题
A．They preserve flavor in packaged foods. B．They preserve the color of meats. C．They are the objects of research. D．They cause the animals to become fatter.
The word "carcinogenic" means most nearly the same as（）...
单项选择题The word "carcinogenic" means most nearly the same as（）
A．trouble-making B．color-retaining C．money-saving D．cancer-causing
Seeing and perceiving are （）A．the same actionB．two sepa...
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
The best title for this selection is（）.A．How We SeeB．Le...
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
