题目内容

The relative effects of heredity and environment are most clearly ____(看得到的) in identical twins.

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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.

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).