Though all the subjects were drawn from a population of European extraction, care was taken to see that all subjects, friends and strangers, were taken from the same population.( )
A提取
B开采
C拔牙
D血统
Though all the subjects were drawn from a population of European extraction, care was taken to see that all subjects, friends and strangers, were taken from the same population.( )
A提取
B开采
C拔牙
D血统
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