2. 外语
  3. A British study has found that B vitamins can reduce brain shrinkage in older people with mild memory loss. It【B1】______that B v

A British study has found that B vitamins can reduce brain shrinkage in older people with mild memory loss. It【B1】______that B v

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问题     A British study has found that B vitamins can reduce brain shrinkage in older people with mild memory loss. It【B1】______that B vitamins caused an average 1/3 reduction in brain shrinkage among adults who had trouble remembering. David Smith was a leader of the study. He【B2】______the use of the vitamins as simple and safe. He also said researchers do not yet know if B vitamins could【B3】______or slow Alzheimer’s disease(老年痴呆症).
    Vitamins are important for good health. These complex organic substances help to【B4】______chemical changes within cells. If we do not get enough of the vitamins we need in our food, we are at risk of developing【B5】______diseases. Some shrinkage of the brain is thought to happen【B6】______ as people grow older. Yet studies have shown a correlation between a larger shrinkage and Alzheimer’s disease.
    The researchers say about one in six people over the age of 70 have problems with mental operations. They say half of these people【B7】______ serious loss of mental ability, as in Alzheimer’s disease. Over time, the disease robs people of their memories. Finally, it【B8】______their ability to care for themselves.
    Prof. Smith had a warning for older adults worried about memory loss. He said they should talk to their doctors before starting to take the vitamins. He added that the vitamins could speed the【B9】______of some cancers. The results did not show a difference in loss of abilities such as【B10】______, language and memory. That was true whether or not the people took the vitamins.
【B4】
选项
答案carry out
解析 语义推断题。空格前为help to，故此处应该填入动词。结合录音可知，答案为carry out。
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