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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单项选择题
Such an ______ act of hostility can only lead to war.
A．overt
B．episodic
C．ample
D．ultimate
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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