题目内容

Last summer 2,356 sets of twins showed up from around the world to watch and take part in ____(游行), fireworks, magic acts, a 5K race, and more than 100 contests: contests to honor the oldest twins, the youngest, the most alike, the least alike, the twins with the widest combined smile.

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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.

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.