题目内容

Considering the nature of their ____(环境的) experiences, the differences in Helen and Gladys are not surprising.

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____(例外) occurred when one twin had developed a rather severe 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.

On the other hand, traits that are not liable to be influenced by the environment are more likely to ____(显示) a high degree of similarity in identical twins.

Helen was confident, ____(有风度的), made the most of her personal appearance, and showed considerable polish and ease in social relationships.

____(遗传) or environment: which is stronger?