A．The right brain hemisphere remains awake all night long.
B．Both hemispheres of the brain remain active all night long.
C．The left brain hemisphere remains awake during deep sleep.
D．One brain hemisphere remains more awake than the other during deep sleep.
A．There was nothing different in alertness or activity in either hemisphere.
B．There was no obvious difference between both brain hemispheres.
C．The left hemisphere remained active in deep sleep phase.
D．The right hemisphere remained active in deep sleep phase.
A．It offers a better chance for high-level students.
B．It divides children off for different schools.
C．It selects students for comprehensive system of schooling.
D．It is an entrance examination for junior middle schools.