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  3. Scientists seeming to cure and prevent insulin-dependent diabetes have discovered what goes wrong in the bodies of a special bre

Scientists seeming to cure and prevent insulin-dependent diabetes have discovered what goes wrong in the bodies of a special bre

admin2012-01-05  44
问题    Scientists seeming to cure and prevent insulin-dependent diabetes have discovered what goes wrong in the bodies of a special breed of mice prone to the affliction and, using that knowledge, have developed a way to prevent the disease in the Roberts.
   Because mouse diabetes is almost identical to human type 1 diabetes (also called insulin-dependent or juvenile-onset diabetes), the researchers say they may be ready to test their techniques on humans in five years and that a treatment for patients in the early stages of the disease could be ready to test in two years.
   In findings—published in last week’s issue of Nature—were obtained by two research groups working independently. One was led by Daniel L. Kaufaman, a molecular biologist at the University of California at Los Angeles, and the other by Hugh O. Mcdevit of Stanford University.
   "There’s great excitement at the prospects for this research" said James Gavin, a diabetes specialist and president of the American Diabetes Association. "These are studies you have to call convincing. They are clearly likely to have human applications. "
   Type 1 diabetes has long been known to be an autoimmune disease—an ailment in which the immune system, instead of defending the body against invading microbes, mistakenly attacks part of the body. In diabetes, it kills the special cells in the pancreas that make insulin. Without insulin, cells cannot take in sugar. The body is deprived of sugar energy and its accumulation in the bloodstream damages nerves and other issues. The potential new treatments would either stop the immune system from making a mistake or suppress an existing erroneous response.
According to scientists diabetes causes all the following EXCEPT ______.
选项 A、lack of insulin
B、accumulation of sugar energy
C、brain damages
D、disorder in the immune system
答案C
解析 最后一段提到糖尿病发牛的原因。首先是免疫系统，它非但不抵御进入体内的细菌，反而攻击身体的某些部位，所以免疫系统混乱，不能正常工作，故D正确。糖尿病将胰岛里产生胰岛素的细胞杀死，没有了胰岛素就不能吸收糖分，糖分堆积在体液中和其他组织中，体内缺少糖分提供能量，故A，B正确。C在文中并未提及。
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