题目内容

In a study of nineteen sets of twins who had been separated from birth, ____(调查者) found that in approximately two thirds of the sets there were no more significant differences than existed among unseparated pairs of twins.

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

What we can do is set by the genes, but what we actually do is ____(大部分) determined by the environment.

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.

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.