[originaltext]W: One of the most interesting experiments with dolphins must be

游客2024-05-16  11

问题  
W: One of the most interesting experiments with dolphins must be one done by Doctor Jarvis Bastian. What he tried to do was to teach a male dolphin called Bass and a female called Doris to communicate with each other across a solid barrier.
M: So how did he do it exactly?
W: Well, first of all, he kept the two dolphins together in the same tank and taught them to press levers whenever they saw a light. The levers were fixed to the side of the tank next to each other. If the light flashed on and off several times, the dolphins were supposed to press the left-hand lever followed by the right-hand one. If the light was kept steady, the dolphins were supposed to press the levers in reverse order. Whenever they responded correctly, they were rewarded with fish.
M: Sounds terribly complicated.
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 couldn’t 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 to 21 are based on the conversation you have just heard.
19. What is the purpose of Doctor Jarvis Haitian’s experiment?
20. What were the dolphins supposed to do when they saw a steady light?
21. How did the second stage of the experiment differ from the first stage?

选项 A、Only one dolphin was able to see the light.
B、The male dolphin received more rewards.
C、The lever was beyond the dolphins’ reach.
D、Both dolphins were put in the same tank.

答案 A

解析 女士在介绍完实验的第一阶段后,男士表示实验内容对海豚来说很复杂,女士则说第二阶段更困难。因为在第二阶段,只有Doris could see the light indicating which lever to press first(能看到指示该先压哪个杠杆的灯光),故答案为[A]。对话中比较处常设为考点,听音时可以适当做笔记。
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