题目内容

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

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

When she was in the third grade, the family moved to a rather isolated part of the Canadian Rockies, where there were no schools, and Gladys' formal education came to an end, and was not ____(中断之后继续) until the family moved to Ontario.

They do not indicate what would happen if these identical individuals were raised ____(单独地).

Exceptions occurred when one twin had developed a rather ____(严重的) 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 infancy.