18．Have you ever heard of donating blood？Medical workers on board collect blood from volunteers．The blood is then stored up and given to people who have lost a large amount of it due to accidents or diseases．
Blood is one of the most important substances （物质） supporting our lives．But for now，the only way we can get more of it is through donation．And donated blood has its own problems．First of all，certain blood types are extremely rare．Type O negative blood （O-），for example，only exists in 7percent of people，according to Sunday Times．There are fewer donors and therefore there isn't enough of this type of blood for everybody who needs it．In addition，donated blood comes from various people，which means that it has to be examined carefully for disease such as hepatitis （肝炎） and HIV to make sure that it's safe for transfusion．
This is why scientists all over the world have been trying to make blood in labs．And now，someone finally succeeded-Marc Turner at the Scottish National Blood Transfusion Service has produced blood fit for transfusion，reported Forbes．
Unlike many other scientists，who have tried to make blood substitutes by mixing up different ingredients together，Turner chose to grow blood directly from human stem cells （干细胞）．He developed a special technique to create a chemical environment similar to that in our bone marrow （骨髓）．This environment encourages stem cells to develop fully into red blood cell．
According to Turner，his version of artificial blood is unlikely to contain disease viruses or produce side effects．And the best part is that what he managed to produce was type O-blood．Not only is it a rare blood type，it's also a universal type，which means it can be transfused into any patient．
The new blood is scheduled for human tests in 2016．However，Turner stressed that the new study should not be taken as a signal for people to stop donating blood because it could be another 20years before the artificial blood can be manufactured on a large scale．"It is one thing to bake a cake and another thing to bake a cake 100times the size，"said Turner．"It's not just a matter of putting in 100times the ingredients．"
32．According to the text，a potential danger of blood transfusion is thatB．
A．it is impossible to store up large amounts of blood
B．blood transfusion may lead to some terrible infections
C．it is very hard to find matches for certain blood types
D．blood transfusion often leads to serious side effects
33．The study Marc Turner did is different from those of many other scientists in thatA．
A．he grew artificial blood using human stem cells
B．he was able to discover the special function of type O-blood
C．he produced the first artificial blood in the world
D．he used special ingredients to produce artificial blood cells
34．We can know from the text thatD．
A．people with type O-blood can receive blood transfusion from anyone
B．the practice of blood transfusion will end in 20years
C．the new blood produced by Turner has been experimented on human beings
D．the artificial blood produced by Turner will be a safe and universal type
35．Which of the following words best describes Turner's attitude towards the application of his artificial blood？C
A．Pessimistic． B．Doubtful．
C．Cautious． D．Uninterested．
分析 本文是一篇新闻报道类阅读，属于新闻报道．你有没有听说过献血？医务人员从志愿者那里收集血液，然后将血液储存起来，给予由于意外或疾病而大量损失的人．本文以此展开谈论，报道了特纳生产的人造血液．
解答 32．B．推理判断题．根据In addition，donated blood comes from various people，which means that it has to be examined carefully for disease such as hepatitis （肝炎） and HIV to make sure that it's safe for transfusion．可以推测出，输血可能导致一些严重的感染．故选B．
33．A．细节理解题．根据Unlike many other scientists，who have tried to make blood substitutes by mixing up different ingredients together，Turner chose to grow blood directly from human stem cells （干细胞）．可知，与许多其他科学家不同，他们试图通过将不同的成分混合在一起来制造血液代用品，特纳选择从人类干细胞直接产生血液．故选A．
34．D．推理判断题．根据According to Turner，his version of artificial blood is unlikely to contain disease viruses or produce side effects．可以推测出，特纳生产的人造血液将是一种安全通用的血液．故选D．
35．C．推理判断题．根据However，Turner stressed that the new study should not be taken as a signal for people to stop donating blood because it could be another 20years before the artificial blood can be manufactured on a large scale．"It is one thing to bake a cake and another thing to bake a cake 100times the size，"said Turner．"It's not just a matter of putting in 100times the ingredients．"可以推测出，特纳对于人造血液的应用是谨慎的态度．故选C．
点评 本文是一篇新闻报道类阅读，题目涉及多道细节理解题，推理判断题．做题时学生应仔细阅读原文，把握文章主要内容，联系文章上下文内容并结合所给选项含义，从中选出正确答案，一定要做到有理有据，切忌胡乱猜测
