The expression“a thirst for knowledge" may soon have a new meaning for millions of people who have no way to get clean water. Researchers have developed a book with specially treated pages that can turn dirty water into clean and drinkable water. They say their invention could improve the lives of many in the developing world.

About 700 million people around the world are at risk of disease or even death because their drinking water is not clean. The water is polluted by harmful bacteria.

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(过滤器)to remove harmful microorganisms(微生物) that can pollute drinking water. The filter kills the organisms that pass through it.

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 cleaned.

Ms. Dankovich, the inventor, says each page can treat up to 100 liters of water. She recently presented her invention at the meeting of the American Chemical Society in Boston, Massachusetts. She was asked whether she had considered adding classic literature on the book's pages.

"The idea of classic texts?that's of interest maybe later. We have discussed a little bit more exciting text. But we really haven't had the time to go through that part," she says.

Teri Dankovich and another researcher tested the drinkable book in Bangladesh, Ghana and South Africa. The tests proved to be successful.

Water for Life, a non-governmental organization, has provided financial support for the project.

29. What do we learn about the book from the text?

A. It sells well around the world. B. It has pages with several functions.

C. It is about environment protection. D. It can treat about 100 liters of water.

30. What does the underlined phrase "that part" in Paragraph 6 refer to?

A. Classic texts. B. Invention presentation.

C. Exciting discussion. D. Financial support.

31. In which country did not the researchers test the drinkable book?

A. Bangladesh. B. Ghana C. South Africa. D. America.

32. What is the main idea of the passage?

A. Researchers have found a way to save those being ill.

B. Millions of people are in great need of drinkable water.

C. Book pages could provide safe drinking water.

D. Knowledge is as important as drinkable water.

D

Love to sink into your chairs and relax when you get to school? Then you will not be happy to hear that schools all over the world are seriously considering exchanging traditional desks for ones with no seats at all — Yes, that means you will be encouraged to stand through those already too long math and science lessons! Why would anyone even think of putting kids to such cruelty? Experts say it improves their health and helps fight obesity. While that may seem a little far-fetched (牵强的), the officials at the few schools around the world seem to agree.

Among them are educators from the College Station Independent School District in Texas, who recently completed a week-long experiment involving 480 students across three elementary schools. The 374 kids that agreed to participate in the study were provided with a device that helped record step count and calorie consumption over the entire period.

All 25 teachers involved in the study reported that students appeared to be more alert and concentrate better, when allowed to stand. The one thing that did surprise the researchers was that younger kids were more willing to stay standing than kids in higher grades. They believe this may have something to do with the fact that after years of being asked to “sit still”, older kids have a harder time adjusting to this unexpected freedom.

American schools are not the only ones reporting success with stand-up desks. Four Catholic schools in Perth, Australia, which have been testing them since October 2013, have seen similar results. In May 2014, Grove House Primary School in Bradford, West Yorkshire, became Europe’s first test one, with a seven-week trial that involved the use of desks made by Ergotron in their fifth-grade classrooms. While official results are not out yet, early reactions from both teachers and students, have been extremely encouraging.

The findings of these studies and others done previously, all seem to mean that allowing kids to move around in classrooms is a win-win for students and teachers — it helps kids get healthier and provides educators with a more engaged audience.

33. According to the teachers, older students may not like stand-up desks because ____________.

A. they are cleverer than younger students

B. they are easily tired of standing long

C. they have formed the habit of sitting

D. they do badly in class while standing

34. What is most likely to be the result of the seven-week trial?

A. The standing desks can’t be used at all.

B. It is good for students to use stand-up desks.

C. More tests should be done in other schools.

D. The students are different in personality.

35. Why do the teachers like the standing desks?

A. Because the educators can draw the students’ attention.

B. Because the teachers can keep the students healthy.

C. Because the students can have a walk in the classroom..

D. Because the standing desks can keep the students concentrated.