题目内容
and is an admitted sun worshipper, whose habits Jeanne does not share. A new study of twins suggests you
can blame those coarse (粗糙的) wrinkles, brown or pink spots on too much time in the sun, smoking, and
being overweight.
Because twins share genes, but may have different exposures to environmental factors, studying twins
allows an "opportunity to control for genetic susceptibility (易受影响性)," Dr. Elma D. Baron, at Case
Western Reserve School of Medicine in Cleveland, Ohio, and his colleagues explain in the Jatest issue of
Archives of Dermatology.
Their analysis of environmental skin-damaging factors in 65 pairs of twins hints that skin aging is related
more to environment and lifestyle than genetic factors.
But when it comes to skin cancer, the researchers say their findings support previous reports that both
environment and genes affect skin cancer risk.
Baron's team examined facial skin of 130 twins, 18 to 77 years old, who lived mostly in the northern
Midwest and Eastern regions of the US, who were attending the Twins Days Festivalin Ohio in August 2002.
At this time, each of the twins also separately reported how their skin burned or tanned (晒黑) without
sunscreen, their weight, and their history of skin cancer, smoking, and alcohol drinking. The study group
consisted of 52 fraternal (异卵双生) and 10 identical twin pairs, plus 3 pairs who were unsure of their twin
status.
From these data, the researchers noted strong ties, outside of twin status, between smoking, older age,
and being overweight, and having facial skin with evidence of environmental damage. By contrast, sunscreen
use and drinking alcohol appeared related to less skin damage.
Baron and his colleagues say the current findings, which highlight ties between facial aging and potentially
avoidable environmental factors-such as smoking, being overweight, and unprotected overexposure to the
sun's damaging rays-may help motivate people to minimize these risky behaviors.
B. Skin aging is related more to environment and lifestyle than genetic factors.
C. Only identical twins can take part in the research.
D. Sunscreen use cannot help people have less skin damage.
B. It may guarantee the research is not influenced by genetic factors.
C. It gives others an opportunity to control twins' genes.
D. It helps find twins are exposed to different environments.
B. The environmental factors are unavoidable.
C. Being exposed to the sun is absolutely damaging.
D. There is little relationship between skin aging and environment.
B. identical twins research
C. aging skin and environmental factors
D. genes and lifestyles
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