Passage two 　　Questions 31 to 33 are based on the passage you have just heard.

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A．To test how responsive dolphins are to various signals.
B．To find out if the female dolphin is cleverer than the male one.
C．To see if dolphins can learn to communicate with each other.
D．To examine how long it takes dolphins to acquire a skill.

A．He has better memories of childhood.
B．He was accused of family violence.
C． He is a habitual criminal.
D． He was wrongly imprisoned.

A．The serious accident may leave Anna paralyzed.
B．The man happened to see Anna fall on her back.
C．The injury will confine Anna to bed for quite a while.
D．The doctor’s therapy has been very successful.