题目内容

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

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Exceptions 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 ____(相似之处) that exist between identical twins, even those who have been separated from infancy.

She stayed at home and did housework until she was seventeen, and then went to work in a knitting ____(工厂).

The relative effects of heredity and environment are most clearly ____(看得到的) in identical twins.

Therefore heredity is fate, a kind of ____(命运) .