填空题

Hay has found that both ______ and social factors combine to put twins at a disadvantage.

【参考答案】

genetic
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填空题
Hay sees a trend towards more fraternal twins born to older woman.
填空题
Hay found that parents of twins tend to favor the first-born baby, giving that twin more time and attention. Even when they start school, the first-born twin does better than the second-born.
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