单项选择题

A. Both dolphins were put in the same tank.
B. The male dolphin received more rewards.
C. The lever was beyond the dolphins’ reach.
D. Only one dolphin was able to see the light.
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单项选择题
A. They are less healthy than we expected. B. They are not as natural as we believed. C. They are not as expensive as before. D. They are more nutritious and delicious.
A. They are less healthy than we expected. B. They are not as natural as we believed.
C. They are not as expensive as before. D. They are more nutritious and delicious.
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