题目内容

____(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.

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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?

The relative effects of heredity and environment are most clearly observable in ____(同样的) twins.