单项选择题


A．call in
B．call over
C．call upon
D．call out
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单项选择题
It is ______ to believe that the quantity of water keeps unchanged when it is contained 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
单项选择题
After children have helped to set the table with impressive accuracy, they ______.
A．are able to help parents serve dishes
B．tend to do more complicated housework
C．are able to figure out the total pieces
D．can enter a second-grade mathematics class
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