2.txt

c语言编写的十字链表

*Blue-eyed men prefer blue-eyed women, apparently because 
eye color can help reveal whether their partner has been 
faithful, researchers said on Monday. "Before you request 
a paternity test, spend a few minutes looking at your child's 
eye color," Bruno Laeng and colleagues at the University of 
Tromso in Norway said in the study. 

*Under the laws of genetics, two parents with blue eyes will 
always have blue-eyed children, it said. So a blue-eyed man 
can know his blue-eyed wife or partner has cheated on him if 
their child has brown eyes. "Blue-eyed men may have unconsciously 
learned to value a physical trait that can facilitate recognition 
of own kin," the scientists said in the journal Behavioral Ecology 
and Sociobiology. 

*The scientists asked 88 students to rate the attractiveness 
of models based on pictures manipulated so that half of them had 
blue eyes and the other half had brown eyes. The blue-eyed men 
in the group showed a preference for blue-eyed women. But brown-eyed 
men, who cannot find any clues about paternity from a child's eye 
color, had no preferences by eye color. Women showed no preference 
for brown- or blue-eyed men, regardless their own eye color. 

*A quarter of children born to two brown-eyed parents who have both 
brown and blue-eye genes among their ancestors will have blue eyes. 
The rest will be brown. In a second study, 443 young adults of both 
sexes were asked about the eye color of their partners -- blue-eyed 
men were also the group with the highest proportion of partners with 
the same eye color.