Last week, speakers at a program in Washington discussed using nanotechnology (纳米技术) to improve health care in developing countries. Peter Singer at the University of Toronto says a nanotechnology called quantum dots could be used to (36)__________cases of malaria. He says it could offer a better way than the traditional process of looking at a person’’s blood under a (37)__________. In poor countries, this process is often not (38)__________. As a result, sick people may get treated for malaria even if they do not have it. Such misuse of medicines can lead to drug (39)_________. Quantum dots are particles that give off light when (40) __________. Researchers are studying ways to program them to (41)__________diseases by lighting up in the presence of a targeted molecule. Experts say nanotechnology shows promise not just for (42)__________diseases, but also for treating them. Piotr Grodzinski of the National Institutes of Health talked about how nanotechnology could make drugs more (43)__________. He talked about cancer drugs already developed with nanotechnology. (44)_____________________. Andrew Maynard is the chief scientist for the Project on Emerging Nanotechnologies at the Woodrow Wilson Center. (45) _____________________. 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 particles. (46) _____________________.