单项选择题

A. To test how responsive dolphins are to various signals.
B. To examine how long it takes dolphins to acquire a skill.
C. To see if dolphins can learn to communicate with each other.
D. To find out if the female dolphin is cleverer than the male one.
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单项选择题
A. It has attracted worldwide attention. B. It will change the concept of food. C. It can help solve global food crises. D. It will become popular gradually.
A. It has attracted worldwide attention. B. It will change the concept of food.
C. It can help solve global food crises. D. It will become popular gradually.
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A. Good or bad, they are there to stay. B. Believe it or not, they have survived.C. Like it or not, you have to use them. D. Gain or lose, they should be modernised.
A. Good or bad, they are there to stay.
B. Believe it or not, they have survived.
C. Like it or not, you have to use them.
D. Gain or lose, they should be modernised.
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