Andrew Maynard is chief scientist for the Project on Emerging Nanotechnologies at the Woodrow Wilson Center. He noted that Brazil, India, China and South Africa are currently doing nanotechnology research that could help poor countries. But he also noted that there is some risk in using nano-materials. He says nanometer-sized particles behave differently in the body and the environment compared to larger particles7. Experts say more investment in research is needed to better understand these risks.

　　练习：

　　1. Which of the following uses of nanotechnology is NOT mentioned in the passage?

　　A To make beauty products and dirt-resistant clothing.

　　B To produce better and lighter building materials.

　　C To help more accurately diagnose diseases.

　　D To help more effectively treat diseases.

　　2. How can quantum dots be used to confirm diseases?

　　A By traditionally looking at a persons blood under a microscope.

　　B By letting a person take some kind of medicine.

　　C By lighting up in the presence of a targeted molecule.

　　D By subjecting a person to an X-ray examination.

　　3. How can nanotechnology be used to make a drug more effective?

　　A By making a drug target the focus of a disease.

　　B By changing the structure of the body cells.

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