2. 外语
  3. Researchers report that obesity relates to DNA. Some children get obese【C1】______they lack particular chunks of DNA, which kicks

Researchers report that obesity relates to DNA. Some children get obese【C1】______they lack particular chunks of DNA, which kicks

admin2013-06-17  68
问题     Researchers report that obesity relates to DNA. Some children get obese【C1】______they lack particular chunks of DNA, which kicks their hunger into overdrive.
    The British researchers【C2】______the DNA of 300 children who’d become very fat by age 10. They found【C3】______that several rare deletions may promote obesity, including one kind they found in【C4】______than 1% of about 1 200 severely obese children. That【C5】______, on chromosome (染色体) 16, apparently causes trouble because it【C6】______a gene that the brain needs to【C7】______to the appetite-controlling hormone leptin (瘦体素)， said Dr. Sadaf Farooqi of Cambridge University. Children with a chromosome 16 DNA deletion have a very strong【C8】______to eat.
    The work has already produced a real-world【C9】______Farooqi said four children with the chromosome 16 deletion had【C10】______drawn the attention of British child welfare authorities, who blamed the parents【C11】______overfeeding them. "We were able to【C12】______" and get the parents of two children off the hook, and the other two cases are【C13】______discussion, she said. That’s happened before the scientists uncovered【C14】______causes for severe childhood obesity, she said. "It’s a slightly【C15】______outcome of our research, but one we think is very important," she said.
   【C16】______scientists had previously discovered particular genes that promote obesity when damaged, the new work looked at【C17】______chunks of DNA that can span several genes.
    Eric Ravussin, an obesity expert, who wasn’t【C18】______in the study, said the work provides "a gold mine of information". That’s because it【C19】______specific chromosome areas that scientists can explore to【C20】______obesity-related genes, he said.
【C8】
选项 A、energy
B、source
C、drive
D、ability
答案C
解析 名词辨析题。第一段提到缺乏某种DNA会导致饥饿加速，第二段提到研究表明染色体16中DNA的缺失使大脑无法控制食欲，从而引起了肥胖问题。由此可知，染色体16中某一特定DNA的缺失会引发饥饿，即食欲增强，drive作名词有“欲望，欲求”之意，符合句意。
转载请注明原文地址:https://kaotiyun.com/show/e207777K
0

大学英语四级

相关试题推荐
随机试题
最新回复(0)