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
单项选择题
A. At six. C. An hour earlier. B. At seven. D. At five.
A. At six.
C. An hour earlier.

B. At seven.
D. At five.
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