单项选择题

In some countries preschool education in nursery schools or kindergartens ______ the 1st grade.

A．leads
B．precedes
C．forwards
D．advances
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In the airport, I could hear nothing except the roar of aircraft engines which ______ all other sounds.
A．dwarfed
B．diminished
C．drowned
D．devastated
单项选择题
______ the heat to a simmer and continue to cook for another 8—10 minutes or until most of the water has evaporated.
A．Turn off
B．Turn over
C．Turn down
D．Turn up
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