单项选择题


A．at times
B．at one time
C．at odd times
D．at all times
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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 main idea of this passage is that ______.
A．man's elementary number sense is found in lower species
B．birds have a limited number sense
C．animals cannot count
D．number sense is a primitive form of counting
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