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  3. Which of the following uses of nanotechnology is NOT mentioned in the passage? Which of the following is the possible risk in u

Which of the following uses of nanotechnology is NOT mentioned in the passage? Which of the following is the possible risk in u

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问题 Which of the following uses of nanotechnology is NOT mentioned in the passage?
Which of the following is the possible risk in using nano-materials mentioned in the passage?
选项 A、They may cause some damage to the body cells.
B、They are harmful materials themselves.
C、They may store in the body.
D、They may behave differently in the body and the environment.
答案D
解析 第五段第三、四句说到，纳米材料的颗粒在体内和在体外环境中作用可能不太一样，因此可能存在某种危险性。其实言外之意还存在未知数，所以后一句才说需要更多投入以便搞清它们的危险性。
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