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Some animals apparently can resist cancer by strengthening their immune system in preparation for winter, Johns Hopkins research

admin2011-03-01  54
问题    Some animals apparently can resist cancer by strengthening their immune system in preparation for winter, Johns Hopkins researchers said on Wednesday.
   The scientists said their study is the first to show that the central nervous system, reacting to environmental changes, may spark changes in the body’s immune system that control the growth of tumors.
   They said if that is the ease, a better understanding of how the process works eventually could lead to new cancer treatments.
   Dr. Randy Nelson, an associate professor of psychology at Hopkins, stressed at a meeting of the Society of Neuroscience that further study would be needed to confirm a connection between the length of the day, the animals’ immune system and cancer. More work also would be needed to show that the findings could be applied to human cancer.
   Dr. Faye Austin, an immunologist with the National Cancer Institute in Bethesda, said: "It’s a very intriguing observation that the length of exposure to light can affect the growth of a tumour. But I think that the draws really need further work to clarify the mechanics."
   But Austin said the findings were surprising and important, only because they open up a new approach for research.
   Studies showed that stress weakened the immune system in animals. They figured that because winter is stressful, the season probably causes exertion (影响) on the immune system.
   The researchers reasoned that animals that compensated by boosting (促进) their immune systems as winter approached would have a better chance of surviving and producing offspring.
   "In the same way that animals have evolved to select the best time to breed, it struck me that animals ought to be able to predict when conditions would be challenging immunologically." Nelson said.
Animals can strengthen their immune system in preparation for winter because ______.
选项 A、when season changes, the central nervous system reacts to environment and that sparks changes in the body’s immune system
B、animals have shorter exposure to light in winter than in summer
C、animals have evolved to select the best time to breed and be able to predict the change of conditions
D、all of the above
答案A
解析 见文中一、二段，可显然得出答案。
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