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  3. Increases in the level of high-density lipoprotein(HDL)in the human bloodstream

Increases in the level of high-density lipoprotein(HDL)in the human bloodstream

游客2024-01-13  38
问题 Increases in the level of high-density lipoprotein(HDL)in the human bloodstream lower bloodstream-cholesterol levels by increasing the body’s capacity to rid itself of excess cholesterol. Levels of HDL in the bloodstream of some individuals are significantly increased by a program of regular exercise and weight reduction. Which of the following can be correctly inferred from the statements above?
选项 A、Individuals who are underweight do not run any risk of developing high levels of cholesterol in the bloodstream.
B、Individuals who do not exercise regularly have a high risk of developing high levels of cholesterol in the bloodstream late in life.
C、Exercise and weight reduction are the most effective methods of lowering bloodstream cholesterol levels in humans.
D、A program of regular exercise and weight reduction lowers cholesterol levels in the bloodstream of some individuals.
E、Only regular exercise is necessary to decrease cholesterol levels in the bloodstream of individuals of average weight.
答案 D
解析 如果高浓度脂蛋白的含量提高造成胆固醇含量降低，并且如果一个特定的项目增加了某些人的高浓度脂蛋白的含量，也就是说一些从事这个项目的人会使胆固醇含量降低，因此可以正确地推导出来选项(D)，因此(D)是正确答案；不能正确地推导出选项(A)，因为论述中没有提出任何关于体重不足与胆固醇含量之间的联系；选项(B)和(E)都无法被推导出来，因为没有说明锻炼本身对于增加高浓度脂蛋白含量或降低胆固醇含量是必要条件还是充分条件；选项(C)不合适，因为并没有提到关于降低胆固醇含量的其他办法。
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