8．Researchers around the world have been trying their hand at making better use of the huge amount of wind energy available in nature to produce clean energy．Apart from this，studies are being carried out to harness（利用） usable wind energy produced by man-made technologies．
One useful source identified by Indian inventor Santosh Pradhan about two years ago is a speeding train，which produces fierce wind that can be transformed into electricity．
According to Pradhan's proposal，with a few small improvements in existing trains running in Mumbai，the largest city in India，at least 10，000megawatts（兆瓦） of electricity could be harvested each day．
Building on this principle，designers Ale Leonetti Luparinia and Qian Jiang from Yanko Design have created a device（装置） called T-Box that harnesses wind energy from speeding trains．
T-Box can be placed within the railway tracks．It is half-buried underground between the concrete sleepers（水泥枕木），which does not disturb the normal train operating at all．According to Yanko，around 150T-Boxes can be fitted along a 1，000-meter railway track．
A train running at a speed of 200kph can produce winds blowing at 15miles a second．Based on this calculation，150T-Boxes can produce 2.6KWH of electricity per day．The T-Box's design won a silver medal in last year's Lite-On Awards and was exhibited last summer at the Xue Xue Institute in Taipei，Taiwan Province．
Though the figures look impressive，it is important to remember that the design is still at a conceptual stage and hasn't taken into account issues such as pieces of waste material produced by the device and the efforts and costs involved in the maintenance（维护） of the device．
We can expect the technology to see the light of the day only after it clears these issues．If so，rail travel，one of the greenest forms of travel，will become greener and more energy-efficient．
46．What can we learn about T-Box？A
A．It is based on Pradhan's idea．
B．It will be fitted on the trains．
C．It can turn electricity into light．
D．It was invented by an Indian scientist．
47．How much electricity can be produced per day by T-Boxes along a railway track of 100km？A
A.260KWH．
B.2.6KWH．
C.150KWH．
D.1.5KWH．
48．It can be concluded from the last two paragraphs thatC．
A．T-Box has proved to be effective in harvesting wind
B．the maintenance of T-Box will be costly
C．there is much to do about T-Box
D．T-Box will come into use soon
49．According to the passage，which of the following statements is TRUE？B
A．The Indian inventor Santosh Pradhan invented the speeding train．
B．The T-Box's design won a silver medal in Lite-On Awards last year．
C．Rail travel has become one of the energy-efficient technologies in the world．
D．The India harvests 10，000megawatts of electricity each day on average．
50．The passage is mainly written toD．
A．encourage more people to travel by train
B．explain the advantages of electricity
C．tell readers how to save energy and money
D．introduce a new invention to readers．
分析 本文是一篇科教类阅读，属于说明文，世界各地的研究人员一直尽力更好地利用自然中可用的大量的风能来生产清洁能源．本文以此展开叙述，主要介绍一种新的绿色能源，可以让我们的出行变得更环保和更有效．
解答 46．A 细节理解题．根据第三段提到According to Pradhan's proposal，with a few small improvements in existing trains running in Mumbai，这是基于Pradhan'的建议，故选A项．47．A 细节理解题．根据第五段提到According to Yanko，around 150 T-Boxes can be fitted along a 1，000-meter railway track．和第六段提到Based on this calculation，150 T-Boxes can produce 2.6 KWH of electricity per day可知是2.6乘以100，故选A项．
48．C 推理判断题．根据倒数第二段提到Though the figures look impressive，it is important to remember that the design is still at a conceptual stage虽然这个数字是很可观的，但要记住这个设计处在概念阶段，故还有很多工作要做，故选C项．
49．B 推理判断题．根据倒数第三段提到The T-Box's design won a silver medal in last year's Lite-On Awards and was exhibited last summer at the Xue Xue Institute in Taipei，Taiwan Province．可知这个设计在去年的光宝创新奖获得银奖，故选B项．
50．D 推理判断题．通过最后一段提到We can expect the technology to see the light of the day only after it clears these issues．If so，rail travel，one of the greenest forms of travel，will become greener and more energy-efficient．我们期望着看到更多的绿色能源，所以可知本文介绍的一种新的能源给读者，故选D项．
点评 本文是一篇科教类阅读，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．
