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exclusively ∧ Coke—in
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单项选择题
The rods of our eyes see ______.
A．colors
B．black and white
C．both colors and black and white
D．visible wavelength colors
单项选择题
Dr. Kleitman ______.
A．has lost so much sleep that he is now suffering from insomnia
B．has conducted experiments on sleepwalkers
C．has slept more than any other living man of his age
D．does not believe that there are any sleepwalkers at all
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