题目内容

____(遗传) or environment: which is stronger?

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

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

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.