Question

13．Beijing is hardly alone in its air pollution problems．The world Health Organization has said that roughly half of the world's urban population is exposed to pollution at least 2.5 times higher than it recommends．
While it may take years to fix this global problem，innovative minds in the Asia region have come up with creative solutions for living with air pollution．
DIY Purifier
Thomas Talhelm started worrying about the air inside his Beijing home during"airpocalypse"（空气末日） in 2013 when Beijing's air quality index skyrocketed to a terrifying 755．
The scholar couldn't afford the luxury of an expensive air purifier．"Filters （过滤器） are actually very simple-a high efficient filter is all you need to get over 96% of the PM2.5，"he said．
With three of his friends，Talhelm created Smart Air，an air purifier consisting of a basic household fan with a high efficient filter attached to it．
It works as efficiently as the big brands selling for thousands of dollars，removing more than 90 percent of PM2.5 in your room，according to Talhelm's research．
Invisible Mask
Infipure's"nose mask"claims to cut 99% of PM2.5 without the trouble of a surgical face mask．
The filters，made from special materials，are inserted into your nose and aim to be undetectable．
"People care about their health，but don't want all the downsides that come with a traditional face mask，"Infipure co-founder Francis Law explained．
Plant Backpack
Taiwanese artist Chui Chih has designed a survival device for an apocalyptic world．
Named Voyage on the Planet，a potted plant is housed inside a clear backpack hooked up to two tubes to bring fresh air to a face mask．It's a bold，abstract idea from an oxygen tank．
Smog Vacuum
Daan Roosegaarde has been working on a smog vacuum that will suck pollutants from the sky to the ground like a vacuum，making way for clean air．
A byproduct of this smog vacuum，namely The Smog Free Tower，is the"smog ring"-a piece of jewelry made from smog particulates（微粒）．
"The pollution we suck up，the small particulates，we don't throw them away．We put them under pressure for a couple of weeks and they crystallize，creating something like a diamond，"Roosegaarde explains．
 
70．Thomas Talhelm invented Smart Air for all the following reasons exceptD．
A．the high price of the big brands
B．the help from three of his friends
C．the poor quality of the indoor air
D．the simple principle behind the device
71．If someone wants to travel around in those polluted days，which product will he most probably choose for the sake of convenience？B
A．Smart Air．
B．Infipure's nose mask．
C．Voyage on the Planet．
D．The Smog Free Tower．
72．In which solution the inventor also makes use of the dust collected from the polluted air？D
A．DIY Purifier．
B．Invisible Mask．
C．Plant Backpack．
D．Smog Vacuum．

Answer 1

分析 本文属于说明文阅读，作者在文章中向我们说明了如今世界上的空气污染越来越严重，并向我们介绍了四个不同的对抗空气污染的装置，分别介绍了它们的功能以及适用范围，使读者能选择适合自己的装置．

解答 70．D  细节理解题，根据第三段when Beijing's air quality index skyrocketed to a terrifying 755；The scholar couldn't afford the luxury of an expensive air purifier；第四段With three of his friends可知Thomas Talhelm 发明这个有他三个朋友的帮助，北京的室内空气质量很差，大品牌的价格高，但是没有包括设备背后的简单原则，故选D．
71．B  细节理解题，根据第七段Infipure's"nose mask"claims to cut 99% of PM2.5 without the trouble of a surgical face mask．The filters，made from special materials，are inserted into your nose and aim to be undetectable．可知Infipure's nose mask可以减少可吸入颗粒物，它能被插到鼻子上，因此适合外出旅行，故选B．
72．D  细节理解题，根据最后一段The pollution we suck up，the small particulates，we don't throw them away．We put them under pressure for a couple of weeks and they crystallize，creating something like a diamond可知Smog Vacuum利用了被污染的空气中的细小颗粒，将它们放在低压下，使他们的结晶看起来像一颗颗钻石，故选D．

点评 考查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，再做出正确选择．在做推理判断题时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．