Thus if we take two unrelated people at random from populati

Thus if we take two unrelated people at random from population,it is likely that their degree of intelligence will be completely different.If,on the other hand,we take two identical twins,they will very likely be as intelligent as each other.


选择哪个?
我选择的是d，理解不来根据两句话
in the second paragraph'if we take two ······each other“ means if we————