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.

A．The comprehensive school tends to neglect some students.
B．More children would like to go to a grammar school.
C．Children may not adapt to the new system.
D．Children seem to have greater gap in achievements.