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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单项选择题
The word radical in the third paragraph is closest in meaning to ______.
A．equal
B．extreme
C．excellent
D．basic
单项选择题
Why does the author mention Horace Mann's early life
A．As an example to show the importance of education.
B．To make the biography more complete.
C．Because it served as the inspiration for his later work in education.
D．In appreciation of the teachers who helped him succee
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