Question

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Millions of Americans take large amounts of vitamin C pills every day because they believe the vitamin will help them stay healthy. However, a new study says vitamin C may help produce substances that can damage the cell’s genetic material, DNA.Scientists at the University of Pennsylvania experimented with vitamin C in test tubes. They published the results in the publication Science.

The scientists studied the effects of vitamin C on a substance produced in the body from fat. That substance is called hydroperoxide. The hydroperoxide can be changed in a cell into substances that can damage DNA. The scientists found that vitamin C easily changed the hydroperoxide into the gene-damaging poisons. Such damage is the first step toward developing cancer.

However, the scientists said the study does not mean that vitamin C causes cancer. But they said people should probably re-consider taking large amounts of vitamin C pills each day. They say it is well known that vitamin C is important for human health. But they say people can get enough vitamin C in the foods they eat. Earlier studies have shown that eating a lot of fruits, vegetables and grains can reduce the chance of developing both heart disease and cancer.

Other researchers agreed. They said the latest study is important in understanding the chemistry of vitamin C. But they said the study did not involve people. The vitamin C was tested in the laboratory only. They said the results might be different in living cells.

Mark Levine is a vitamin C expert at the National Institutes of Health near Washington, D.C. He also questioned whether a similar study in people would produce the same results. Doctor Levine also said people should get their vitamin C in food instead of taking huge amounts in pills to stay healthy. He said research does not support taking a lot of vitamin C.

The United States government says people should get about eighty milligrams of vitamin C each day in the foods they eat. Studies have shown that the body can not use more than two-hundred milligrams of vitamin C each day. Medical researchers say that taking vitamin C pills cannot replace the value of eating healthy foods.

This VOA Special English Science Report was written by Nancy Steinbach.

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Answer 1

成千上万的美国人每天会服用大量的维生素C药片,因为他们相信会帮助他们保持健康。然而，一项新研究显示，维生素C可能有助于产生物质，能破坏细胞的遗传物质，在宾夕法尼亚大学研究DNA的科学家尝试在试管中与维生素C。他们所研究的成果在已经公布了。
科学家从研究当中了解了维生素C能产生一种令人体致肥的物质,这种物质被称为过氧氢化物。然而这些过氧氢化物能进入细胞从而改变并破坏DNA。科学家们发现，这些维生素C能够轻易改变为有害的遗传因子。这种改变有可能成为导致癌变的第一步.
然而，科学家表示，这项研究并不意味着维生素C会导致癌症。但是他们说，人们或许应该重新考虑是否应该继续每天大量服用维生素C药丸。众所周知,维生素C对人类的健康是非常仲要的。但是我们也可以从我们所吃的食物中获取足够的维生素C。在早期的研究表明,多吃水果,蔬菜还有谷类食品能够降低它们向心脏病以及癌变方向发展.
然而其他研究人员也表示同意。他们说，最新的研究比较注重研究维生素C的化学成分，但这项研究并没有涉及人。此项研究只是在实验室进行。所以结果有可能与在活细胞里的转变不一样
马克列文是一名在华盛顿当地的一家国立卫生研究院研究维生素C专家，他也提出假设,此项研究若在人体内进行实验也会得到同样的结果。莱文博士也同样赞成人体内的维生素C是能够从食物中获取的,而不需要大量的服用这些药丸以保持健康。而且专家们也不支持服用大量的维生素C.
美国政府表示，人们应该从他们每一天所吃的食物中维生素C的摄取约八十毫克。研究表明，人体无法适应每一天服用超过两百毫克的维生素C。医学研究人员说，服用维生素C药片的价值不在于代替健康饮食
此报告由Nancy Steinbach编撰

Answer 2

我考试也考这个，你哪个学校的

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