单项选择题

According to the passage, the alpha rhythm is the characteristic of which phase of sleep

A．Stage 1.
B．Stage 2.
C．Stage 3.
D．Stage 4.
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单项选择题
Which of the following can be the best title of the passage
A．The Father of American Public Education
B．Philosophy of Educational
C．Policies of Educational Institutions
D．Horace Mann and the Massachusetts State Board of Education
单项选择题
After how many minutes does an average person repeat the sleep cycle
A．8 to 15 minutes.
B．30 minutes.
C．40 to 60 minutes.
D．80 minutes.
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