Energy drinks can cause heart problems in healthy teenagers.scientists fear．Researchers are urging doctors.parents and teachers to monitor children's drinking more closely because marketing them as r 题目和参考答案——青夏教育精英家教网—

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6．Energy drinks can cause heart problems in healthy teenagers，scientists fear．Researchers are urging doctors，parents and teachers to monitor children's drinking more closely because marketing them as relieving tiredness and providing physical and mental power ignores major concerns．
Dr Fabian Sanchis-Gomar，of Octubre Hospital，Madrid，and his colleagues said the drinks that have gained popularity among 10to 19-year-olds can trigger sudden heart attacks in young，apparently healthy people．
Previous experiments has shown energy drinks high in caffeine （咖啡因） change the way the heart beats and could increase the risk of potentially deadly heart rhythm problems．In healthy adults who consumed the drinks，the left ventricle-which pumps blood around the body-was contracting harder，and still doing so an hour later．
Energy drinks often contain high amounts of labeled caffeine but can also contain"masked"caffeine in the form of guarana，for example，which comes from a Brazilian plant and is identical to caffeine found in coffee beans．Although caffeine is widely used and generally regarded as safe，serious harmful effects have been reported，especially when consumed in larger amount，said the researchers．
"It is important for physicians to understand the lack of regulation in caffeine content and other ingredients of these high energy drinks and their harms．And parents and children should be educated about the risks and the potential development of anxiety and fears coming with drinking large amounts of energy drinks．"
Dr Sanchis-Gomar's team's advice was that one can （250mL） of an energy drink a day is safe for most healthy adolescents，but consumption before or during sports practice should be avoided．

43．The passage is mainly aboutB．
A．negative effects of energy drinks on healthy people
B．potential risks facing teens having energy drinks
C．the danger of heart problems caused by caffeine
D．a new finding of a medical research
44．Which of the following statements about energy drinks is TRUEC？
A．They provide physical and mental power．
B．They lead to deadly heart rhythm problems．
C．They often contain more caffeine than marked．
D.250mL of caffeine a day is safe for adolescents．
45．How does the author draw his conclusion on energy drinksC？
A．By doing survey and interview．
B．By gathering data and description．
C．By describing results of experiments．
D．By making comparison and detective．
46．Which best describes the author's attitude towards the current situationA？
A．Objective．
B．Sympathetic．
C．Approving．
D．Annoyed．

分析本文属于说明文阅读，作者通过这篇文章主要向我们描述了能量饮料会导致健康的青少年的心脏问题，它通常含有高量的咖啡因，会增加潜在致命的心脏节律发病的风险，因此呼吁父母和孩子应该接受有关大量饮用能量饮料导致的潜在的风险的教育．

解答 43．B．主旨大意题．通读全文，主张主要讲能量饮料会导致健康的青少年的心脏问题，它通常含有高量的咖啡因，会增加潜在致命的心脏节律发病的风险，父母和孩子应该接受有关大量饮用能量饮料导致的潜在的风险的教育；故选B．
44．C．细节理解题．根据文章第四段"Energy drinks often contain high amounts of labeled caffeine but can also contain"masked"caffeine in the form of guarana"，能量饮料通常含有高量的咖啡因，但在包装上只标记部分咖啡因；故选C．
45．C．推理判断题．根据文章第三段"Previous experiments has shown energy drinks high in caffeine （咖啡因） change the way the heart beats and could increase the risk of potentially deadly heart rhythm problems"可知作者是通过描述实验结果得出结论的；故选C．
46．A．推理判断题．通读全文，作者并没有发表自己的意见，只是描述了实验结果和得出的结论，因此可以推测作者的态度是客观的；故选A．

点评考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．

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