题目内容

They do not indicate what would happen if these identical individuals were raised ____(单独地).

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Exceptions occurred when one twin had developed a rather ____(严重的) illness and the other had not; but on the whole everyone is impressed by the great psychological and physical likenesses that exist between identical twins, even those who have been separated from infancy.

Her first foster parents had proved to be unstable, and Helen had been returned to the orphanage after a couple of years; after several months she was again adopted, by a farmer and his wife who lived in ____(东南部的) Michigan.

However, it must be remembered that, although the identical twins who were studied lived in different families far removed from each other, the environments in those families were not, on the whole, ____(本质上) different.

However, it must be remembered that, although the identical ____(双胞胎) who were studied lived in different families far removed from each other, the environments in those families were not, on the whole, substantially different.