题目内容

The following case ____(说明) what happens to identical twins when they are brought up in contrasting environments.

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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 likenesses that exist between identical twins, even those who have been separated from ____(婴儿期).

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.

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.