题目内容

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.

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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) .

Therefore, as one might expect, they maintained the closest ____(相似) to each other in physical appearance, height, and weight.