(2019·石家庄市重点高中高三毕业班摸底考试)WhenGitanjaliRaosharedhowshelik...

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(2019·石家庄市重点高中高三毕业班摸底考试)When Gitanjali Rao shared how she likes “finding solutions to real problems”， it was hard to imagine this dynamic girl could settle a problem that had escaped scientists for years.

In just three months, Rao came up with a device (装置) that can replace the costly and lengthy tests currently used to reliably determine lead levels in our fresh water. Inspired by the current litigation (诉讼) in Flint, Michigan, a case of water pollution from 2014 until present, Rao designed a new testing system that resulted in her being named “America's top young scientist” for 2017.

Rao had been following the water problem for about two years. She was amazed by the number of people affected by lead pollution in water and wanted to do something to change this. Rao spent months trying to convince local high schools and colleges to give her lab time to continue her experiment. At home, Rao worked on her project in the “science room” she asked her parents to create for her. Rao has created a device that uses three parts: a cartridge, a Bluetooth reader and an app. To put it simply, the cartridge contains carbon nanotubes (纳米管) that react to lead. This reaction is then registered by the Bluetooth reader, which sends a signal to a mobile app that can tell you immediately if your water is safe to drink.

Rao appropriately named the device Tethys and is hoping to make a little improvement to get the device on the market. While we may not be aware of any lead pollution present in our aging pipelines, lead poisoning can cause delays in physical and mental development. With Rao believing that the “purpose of science is to make a difference”， her incredible invention could make a difference to millions of people in the United States.

篇章导读：本文是一篇说明文。文章主要介绍了一个女孩发明了一款可以检测水中铅水平的装置，从而解决了一个科学家多年来忽视的问题。

5．What do we know about Rao's device?

A．It's cheap and quick.

B．It's cheap and inaccurate.

C．It's expensive and reliable.

D．It's portable and time­consuming.

6．What made Rao have the idea of designing the device?

A．Her parents' suggestions.

B．Her desire for winning the award.

C．Her interest in settling real problems.

D．The water pollution litigation in Flint.

7．What do the carbon nanotubes function as?

A．Sending immediate signals.

B．Detecting the presence of lead.

C．Recording the reaction results.

D．Showing the water quality results.

8．What does the author think of Rao's invention?

A．It will lead Rao to make a fortune.

B．It will help millions of Americans drink safe water.

C．It will promote the development of science in America.

D．It will soon settle the lead­polluted problem thoroughly.

【回答】

5.A　推理判断题。根据第二段第一句“In just three months, Rao came up with a device (装置) that can replace the costly and lengthy tests currently used to reliably determine lead levels in our fresh water.”可推知，与以前又贵又费时的设备相比，Rao所发明的设备既便宜又省时，与第三段最后一句“This reaction is then registered by the Bluetooth reader, which sends a signal to a mobile app that can tell you immediately if your water is safe to drink.”相呼应，故选A。

6.D　细节理解题。根据第二段第二句“Inspired by the current litigation (诉讼) in Flint, Michigan, a case of water pollution from 2014 until present, Rao designed a new testing system that resulted in her being named ‘America's top young scientist’ for 2017.”可知，Rao设计测试水中铅水平的装置的想法是受一个水污染诉讼的启发，故选D。

7.B　推理判断题。根据第三段倒数第二句“To put it simply, the cartridge contains carbon nanotubes (纳米管) that react to lead.”可推知，这个碳纳米管是可以对铅起反应的，因此可以检测出水中是否含有铅，故选B。

8.B　推理判断题。根据最后一段最后两句中的“While we may not be aware of any lead pollution present in our aging pipelines, lead poisoning can cause delays in physical and mental development.” “her incredible invention could make a difference to millions of people in the United States”和对本段的整体理解可推知，作者认为Rao的发明可以帮助人们快速检测出水中是否含有铅，从而可以大大提高人们饮用水的安全*，意义重大，故选B。

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