单项选择题A．Psychologists do not yet know how people see.B．The best experiments are those in which all factors are controlled.C．The study of perception is going on now.D．Perception does not involve psychological factors.

单项选择题A．Jeff has always liked his sister.B．Jeff made a phone call to his sister.C．Jeff visited his sister.D．Jeff planned to visit his sister.

单项选择题A．It’s easier to talk about the game than to play the game.B．Mary will do better in the second haft of the game.C．Mary probably lost the game.D．Mary doesn’t think the game is worth mentioning.

单项选择题A．The porcupine in Southeast Africa lives mainly on worms.B．Hibernating animals are active in summer.C．When the animal is in its aestivating state, its body temperature doesn’ t drop.D．The body temperature of an aestivative animal doesn’t drop in winter.

单项选择题A．English.B．Spanish.C．French.D．German.