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“The study shows in a very ____(有说服力的) way that genes influence every aspect of behavior,” says Nancy Segal, a psychologist with the Minnesota team.

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In pictures, many of the twins strike nearly identical ____(姿势) .

The twins often have surprisingly similar gestures and ____(姿态) , for instance.

To measure personality, the psychologists try to determine things like how much the twins worry, whether they are cautious or ____(鲁莽的), and how creative they are.

When they were ____(重新团聚) at the age of 39, they discovered a series of striking similarities.