ScientistsatHarvardUniversityhaverecycledakidney(‘腎)-in...

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Scientists at Harvard University have recycled a kidney(‘腎)-in a rat. The researchers removed a kidney from a dead rat. Later, the renewed kidney was put into a living rat. It wasn't perfect. It did, however, show signs of working like a kidney should.     "It's really beautiful work," Edward Ross, a kidney researcher at the University of Florida in Gainesville, told Science News. He didn't work on the new study.

Kidneys are bean-shaped and act like guards in the body. They clean the blood by removing waste and extra water. Every day, an adult's kidneys filter(過濾) enough blood to fill a bathtub half full. Along the way, they produce eight cups of urine(尿) from that waste and water. When a person's kidneys fail, all of that waste stays in the body. Such patients can quickly become very sick and die, unless they are regularly connected to a machine that filters their blood.

At any given time, about 100,000 people in the United States are waiting for a replacement kidney. But healthy donated kidneys are difficult to get. Either a living person must donate one, or a kidney must be removed from someone who just died and earlier had agreed to the donation. In either case, people receiving new kidneys face the risk that their bodies will reject the donated ones.      But there may be another option.  Researchers use knowledge of living things to grow or improve tissue that can aid human health. Harald Ott's team at Harvard started with a "used" kidney. Scientists added kidney cells from rats and blood vessel cells from people to the matrix（母體）. These cells attached themselves and began to multiply. Before long, they formed new kidney tissue.      The scientists placed this renewed kidney into another rat. There it produced a small amount of urine. This experiment shows that the lab-grown kidney can do at least some of the work performed by a healthy kidney.     The results are a promising first step toward helping people with serious kidney problems. "This is still very early, but they've come a long way," Ross said. 32. What can we infer from Paragraph l?      A. Biology is a new and helpful science.     B. It's hard to put the rebuilt kidney into the rat.      C. Kidneys are very important to our life.    D. A used kidney may be recycled for new life.  

33. What does Paragraph 3 mainly talk about?        A. The relationship between kidneys and health.       B. The difficulty of curing serious kidney diseases.       C. The function and importance of kidneys.       D. The methods of curing kidneys diseases.  34. For what purpose does the author use the figure 100,000 in Paragraph 4?       A. To stress used kidneys are hard to get.       B. To show the great need for healthy kidneys.       C. To explain many American people get kidney diseases.       D. To call on people to donate kidneys.  35. Which of the following is true according to the text?      A. The scientists are satisfied with the result of the experiment.      B. Ross is a kidney expert who is involved in the experiment.      C. The function of the renewed kidney is the same as a healthy kidney.      D. The renewed kidney produced a great deal of urine.

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