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For those who have no access to clean water, the phrase “a thirst for knowledge” may soon have a new meaning. Researchers have developed a book with specially treated pages that can make water safe to drink. The researchers say their invention could improve the lives of many in the developing world.

An estimated 600 to 700 million people around the world are at risk of disease or even death because their drinking water is not clean. The water is infected with harmful bacteria or other pollutants. But researcher Teri Dankovich has developed a special book that could turn dirty water into clean, drinkable water. The book contains 25 pages. Each page is about one millimeter thick. The pages contain very small particles (微粒) of silver. The pages can be used as filters (過濾器) to remove harmful microorganisms that can pollute drinking water. The filter kills the organisms that pass through it. Ms. Dankovich says each page can treat up to 100 liters of water. Pictures on the pages show the dangers of dirty water and how to use the book for those unable to read. The pages are made of filter paper. They are designed to be torn from the book. Water can be poured through the paper to be decontaminated.

Teri Dankovich and another researcher tested the drinkable book in Bangladesh, Ghana and South Africa. The tests proved to be successful. At the meeting of the American Chemical Society in Boston, Ms. Dankovich was asked whether she has considered adding classic literature on the book’s pages. “The idea of classical texts – that’s of interest maybe later. But we have discussed a little bit more exciting text. But we really haven’t had the time to go through that part,” she laughed.

Water for Life, a non-governmental organization, has provided financial support for the project. It costs just pennies per page to produce each book.

28. How does the book help people get clean water?     

A. The tiny metal particles on the pages remove the pollution.

B. Its pages can produce small particles when dropped into water.

C. It contains knowledge of water cleaning on each of the pages.

D. It carries information about the harm caused by dirty water.

29. The underlined word “decontaminated” in Paragraph 2 probably mean______.

A. tested             B. boiled                C. absorbed                D. cleaned

30. What can we infer about the drinkable book with classical texts?

A. It will be available soon.

B. It’s a joke to the researchers.

C. It’s a waste of time to do research on them.

D. It has not been on the researchers’ schedule.

31. What is the passage mainly about?

A. Book pages providing safe drinking water.

B. Water pollution in developing countries.

C. Books designed to improve people’s lives.

D. A new test carried out successfully.

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