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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.

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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.

In a study of nineteen sets of twins who had been separated from birth, investigators found that in approximately two thirds of the sets there were no more significant differences than existed among ____(未分离的) pairs of twins.

Her first foster parents had proved to be ____(情绪易变的), 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 southeastern Michigan.