题目内容

The following case illustrates what happens to identical twins when they are ____(抚养) in contrasting environments.

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When she was in the third grade, the family moved to a rather isolated part of the Canadian Rockies, where there were no schools, and Gladys' formal education ____(结束), and was not resumed until the family moved to Ontario.

Helen was confident, graceful, ____(充分利用) her personal appearance, and showed considerable polish and ease in social relationships.

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

These cases demonstrate that individuals with the same genes, when raised in the same environment, will ____(响应) it in much the same way.