题目

阅读理解     A long-term dream for 3D bioprinting is that people on active waiting lists for organ donations might one day have the option of getting a bio-printed organ. Although the ability to produce a functional heart or kidney this way likely lies years in the future, realistic near-term goals include bioprinting simpler structures. Living tissues printed outside the body, however, would still require implantation operation, which often involves large incisions (切口)that increase the risk of infection and lengthen recovery time.     Scientists in Tsinghua University are working on a way to print cells directly inside the body. The idea would be to use existing minimally invasive (微创)operation techniques to insert 3D printing tools into patients and then lay down new tissues.     Much of the previous research has focused on treatments of skin and other tissues in the outer part of the body, because the necessary equipment is normally too large to access :he digestive tract (消化道)and other centrally located organs. Scientists in China wanted to develop a mini bioprinting robot that could enter the human body with relative case, so that they can use the technology for conditions like stomach ulcer (胃溃疡).     The resulting micro robot is just 30 millimeters wide—less than half the width of a credit card — and can fold to a length of 43 millimeters. Once inside a patient's body, it unfolds to become 59 millimeters long and can start bioprinting. The team has constructed clever mechanisms that make the system compact when entering the body yet extend to provide a large working area once past the tight entry. In their experiments, the researchers in China fitted the micro robot onto a long tube that can be inserted through bodily openings and successfully snaked it through a curved pipe into a transparent plastic model of a stomach. （1） What is the aim of Tsinghua's new research? A . To repair wounded skin of the human body. B . To take stomach ulcer out of the human body, C . To print new tissues inside the human body. D . To plant 3D printed organs into the human body. （2） What is the advantage of Tsinghua's new technique? A . Immediate organ sharing. B . Reduced patient suffering. C . Less use of operation equipment. D . Accurate health condition identification. （3） What is the end product of Tsinghua's research? A . A plastic stomach. B . A snake- like long tube. C . A 3D printed structure. D . A mini bioprinting robot. （4） What's the author's purpose in writing the text? A . To guide. B . To inform. C . To advertise. D . To argue. 答案： C B D B

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