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  3. American Scientists Try to Develop Artificial Blood Vessel with the Skin Cell Scientists have grown blood vessels for kidney

American Scientists Try to Develop Artificial Blood Vessel with the Skin Cell Scientists have grown blood vessels for kidney

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问题         American Scientists Try to Develop Artificial Blood Vessel with the Skin Cell
    Scientists have grown blood vessels for kidney patients from their own cells, making it easier and safer for them to use dialysis machines, a new study says.
    Todd McAllister of Cytograft Tissue Engineering in California and colleagues implanted lab-grown blood vessels into 10 patients with advanced kidney disease in Argentina and Poland from 2004 to 2007.
    Early results for two of these patients were announced in 2005. In 2007, the scientists published preliminary findings for another 4 patients in the New England Journal of Medicine. In the most recent study, published in the medical journal Lancet, scientists reported on the new blood vessels in those same patients and 4 others.
    Dialysis patients need a vessel to connect them to dialysis machines. This can be made from their own vessels ~ But because dialysis is done so regularly, kidney patients often run out of healthy vessels and need an artificial one. Those are prone to infection.
    In the study, doctors took a small piece of skin from patients. Ceils from those samples were grown in a lab, to help them produce proteins. From those, scientists made sheets of tissue that were rolled into blood vessels 6 to 8 inches long. The vessels were finished after 6 to 9 months. All of the vessels were implanted into patients’ upper arms, to connect them to dialysis machines.
    The vessels failed in three of the patients, which experts said was not surprising in patients so seriously ill. One other patient withdrew from the study and another died of unrelated causes. In the five remaining patients, the vessels worked for at least 6 to 20 months after they were implanted. Afterwards, those patients needed fewer interventions, including surgeries, to maintain the vessels than regular dialysis patients.
    The study was paid for by Cytograft Tissue Engineering. McAllister said he and colleagues plan to test similar devices in patients with heart and leg problems.
    "It’s difficult to predict what will happen next, but they are on the right track." Vladimir Mironov of the Medical University of South Carolina said. But he worried the vessels, which cost between $ 15,000 and $ 20,000 might be too expensive to be used widely. Dr. Bryan Becker, president of the National Kidney Foundation in the US, said about haft of kidney patients could benefit from these vessels if further tests confirm they work.
We can infer from the last paragraph that scientists and doctors are______.
选项 A、optimistic toward the future of such vessels
B、concerned about the possibility of popularizing the vessels
C、satisfied about the results and findings of the study
D、sure many patients will benefit from the new vessels
答案B
解析 推理判断题。由题干中的fast paragraph定位到第八段第二句可知，这种新型连接管的价格太贵，在推广使用上存在一定困难，因此[B]“担心是否能推广”为正确答案。第一句说将来难以预测，故排除[A]“对将来十分乐观”；文章并没有对实验结果给予评价，故排除[C]；本段第三句说，如果实验能够成功的话，病人会从中受益。也就是说，病人能否受益还是未知数。故排除[D]。
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