单项选择题

A. 4 dollars. C. 12 dollars.
B. 7.5 dollars. D. 8 dollars.
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单项选择题
According to the new findings of Dr. Kleitman, if a person finds getting up early is difficult, most probably______.
A．he is a lazy person
B．he refuses to follow his own energy cycle
C．he is not sure when his energy is low
D．he is at his energy peak in the afternoon or evening
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