50.How is Bill Thomas＇s new concept received?

25. What solution does Rosen offer?

24. What has Rosen found in his experiments about students not allowed to use cellphones?

23. Larry Rosen advises other professors not to follow Duncan＇s lead because

22. What experiment did Duncan carry out to reduce cellphone use in class?

21. What is the finding reported in Doug Duncan＇s published paper?

30. THe author suggests at the end of the passage that India＇s Prime Minister should

29. What has the sand mafia done to make the water problem worse?

28. What do we learn about the report by the National Aeronautics and Space Administration?

27. In addition to the climate, the author thinks another major cause of India＇s water problem is(

26. What is the water problem facing one quarter of India＇s population?