The case history of the twins appears to support the conclusion that ______.
A. inpiduals with identical brains seldom test at the same level
B. an inpidual’s intelligence is determined solely by his environment
C. children reared under average conditions possess average intelligence
D. lack of opportunity hinders the growth of intelligence
正确答案：D
答案为D根据最后一句Givenequalopportunitiesthetwinshavingidenticalbrainswouldhavetestedatroughlythesamelevel作出该项选择
