W: Well, that was the first stage. In the second stage, Doctor Bastian separated the dolphins into two tanks. They could still hear one another, but they couldnt actually see each other. The levers and light were set up in exactly the same way except that this time it was only Doris who could see the light indicating which lever to press first. But in order to get their fish, both dolphins had to press the levers in the correct order. This meant of course that Doris had to tell Bass whether it was a flashing light or whether it was a steady light. M: So did it work?

　　W: Well, amazingly enough, the dolphins achieved a 100 % success rate.

　　Questions 19-21 are based on the conversation you have just heard

　　. Q19. What is the purpose of Doctor Jarvis Bastians experiment?

　　 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.

　　Q20. What were the dolphins supposed to do when they saw a steady light?

　　 A) Produce the appropriate sound.

B) Press the right-hand lever first.

C) Raise their heads above the water.

　　D) Swim straight into the same tank.

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