单项选择题

It is________to believe that the quantity of water keeps unchanged when it is con tained in two different glasses.

A．easy to persuade children
B．hard for most children
C．innate of most children
D．difficult for both adults and children
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单项选择题
It can be inferred from the passage that children are likely to________when they are asked to count all the halls of different colors.
A．give the accurate answer
B．count the number of balls of each color
C．be too confused to do anything
D．make minor mistakes
单项选择题
According to this passage,________is mastered by birth.
A．the ability to survive in a desert island
B．the way of setting tables
C．the basic principles of mathematics
D．the concept of oneness
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