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  3. Imagine one day reading that you had been a subject in a risky science experiment without knowing it. At school, you had been fe

Imagine one day reading that you had been a subject in a risky science experiment without knowing it. At school, you had been fe

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问题     Imagine one day reading that you had been a subject in a risky science experiment without knowing it. At school, you had been fed cereal laced with radioactive chemicals so scientists could learn more about the digestive system. Because the food was radioactive, scientists could easily trace its path through the body.
    Scientists now know that exposure to large amount of radiation can cause cancer, a group of diseases in which bodily cells grow wildly out of control. Some people who were part of the radiation studies later developed cancer and blamed the radiation for causing the cancer. Others are worried the radiation will some day make them sick.
    Some doctors say that, in many cases, such fears are unjustified because the radiation doses used in the experiments were too small to cause harm. They also say that since dangers of radiation were less well understood then than they are now, even researchers who used high doses of radiation didn’t do anything wrong.
    Some critics claim that no excuse is acceptable for not informing subjects about the nature of an experiment and giving them a chance to refuse to participate. Today, government rules require such informed agreement whenever a study uses people.
Which of the following is true according to the passage?
选项 A、Radioactive chemicals can cause bodily cells to grow wildly out of control.
B、When the danger of radiation had not been proved, high doses of radiation were acceptable.
C、Most cancers are caused by radiation.
D、Radioactive chemicals were once used to cure diseases with the digestive system.
答案D
解析 第一段第二、三句“At school, you had been fed cereal laced with radioactive chemicals so scientists could learn more about the digestive system. Because the food was radioactive, scientists could easily trace its path through the body.”。本题为细节题。由定位句可知，在学校，你一直食用含有放射性化学物质的谷类食物，这样科学家可以了解消化系统的情况。因为食物是放射性的，科学家能很容易通过身体追踪到它的路径。也就是说放射性物质过去用于治疗消化系统相关疾病。故选D。
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