单项选择题


A．screens from
B．screens out
C．screens of
D．screens about
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单项选择题
Counting is different from number sense in that counting is ______.
A．dependent on simpler mental activity
B．a kind of ability possessed by man
C．found in animals as well as man
D．the ability to distinguish differences in small sets of objects
单项选择题
The crow was finally deceived because ______.
A．it was not afraid of her men in the tower
B．it did not have a number sense
C．it could not distinguish between four and five
D．it was evening and the crow was unable to count the hunters
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