单项选择题

Criticism without suggesting areas of improvement is not ______ and should be avoided if possible.

A．constructive
B．productive
C．descriptive
D．relative
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单项选择题
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
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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