20．What looks like an ordinary bicycle from a distance is in fact a hand-crafted green bicycle．
After months of painstaking research，designer Vijay Sharma came up with the first model for a bamboo bicycle．
Like a conventional bike，the Bambike uses metal and rubber for brakes，chains and tires．But，Sharma has replaced the steel frame for one made of bamboo，held together with hemp fiber and resin（树脂）．
It can be strong enough to stand rough rides as the bamboo's tube-shaped structure and strength give it shock absorbing power for unsmooth roads．
Sharma says that bamboo has unique characteristics that make it the perfect material for bicycles．
"Steel does not absorb that many shocks but bamboo has the characteristic of absorbing shocks，so even on bad roads you don't require shock absorbers when using the bamboo bike．So that is one added advantage compared to a normal bicycle．"
To overcome the problem of shaking at high speeds，Sharma improved the design by using thicker bamboo，which was treated and hardened with fire and held together with hemp fiber．
How good is the Bambike？It was put to the test at the mountain biking event"Tour of the Nilgiris"in December 2009．
Ravi Ranjan，founder of"Tour of the Nilgiris"，says that the bamboo bicycle has good features and looks beautiful but some additions can improve its efficiency and functionality．
"I feel the Bambike could be improved with front and rear de-railers，gears（齿轮），a better seat post and a pedal（踏板） with cleats which makes the bike more efficient．The bike itself as it is has very good frame structure，and is lighter as compared to many of the bikes available otherwise．"
While the Bambike is still waiting to go into commercial production，some eager cyclists like Manjula Sridhar have had a chance to take it for a spin．She says the concept of Bambike is completely in tune with nature．
"The Bambike is great．Biking means nature，biking means greenery，biking means fitness，so I think，it kind of combines all those together．"
Sharma hopes that the eco-friendly nature of the design will attract cyclists to buy Bambikes．
49．It can be learned from the passage theA of the Bambike is/are made of bamboo．
A．frame B．tires C．chains D．brakes
50．Compared with the normal bicycle，the BambikeB．
A．goes at higher speed by improving the design
B．makes riding on rough roads more comfortable
C．looks more beautiful after being improved
D．uses less steel and more hemp fiber and resin
51．Which of the following best shows Manjula Sridhar's opinion on the Bambike？C
A．The mountain biking event provides a good chance to test it．
B．It not only looks beautiful but also has good characteristics．
C．Riding it can benefit both people's health and the environment．
D．It is lighter than the ordinary one，which makes it easy to carry．
52．What's the author's purpose in writing the passage？A
A．To introduce an eco-friendly bike．
B．To tell a new way of going travelling．
C．To give advice on how to improve the Bambike．
D．To compare the Bambike with the traditional one．
分析 本文主要讲述了一种健康环保的骑行方式，用竹制的自行车，这既是对身体有好处也是环保的．
解答 49．A 细节理解题． 根据文章第二段内容Sharma has replaced the steel frame for one made of bamboo，held together with hemp fiber and resin（树脂）．可知，他用竹制的框架代替了钢制的． 故选A．
50．B 细节理解题．根据文章内容Steel does not absorb that many shocks but bamboo has the characteristic of absorbing shocks，so even on bad roads you don't require shock absorbers when using the bamboo bike．So that is one added advantage compared to a normal bicycle．"竹比起钢而言能更好的起到减震的效果，因此在崎岖的道路用bamboo bike也不需要减震器，这就是它与普通自行车的区别．故选B．
51．C 细节理解题．根据文章内容She says the concept of Bambike is completely in tune with nature．"The Bambike is great．Biking means nature，biking means greenery，biking means fitness，so I think，it kind of combines all those together．骑行意味这自然，能量，健康．那是健康与环保的结合，故选C．
52．A 主旨大意题．根据文章内容，本文主要讲述了一种健康环保的骑行方式，用竹制的自行车，这既是对身体有好处也是环保的．因此作者写问意在向人们介绍该种环保的骑行方式，故选A．
点评 本文是科教类阅读理解．做这类题材阅读理解时要求考生对文章通读一遍，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．
