48. What features in Mediterranean, Nordic and Okinawan diets?

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?

25. What is the difference between the two camps in their suggested solutions to the water problem?

24. A remarkable period began in the 1970s when(

23. In the 1970s and 1980s, the Cuyahoga River fire had a positive effect of

22. What water crisis did the US have in the 1930s?

21. What is the good news about people＇s water use?

30. Mandela was chosen as the leader by the African National Congress when

29. Mandela arrived at court, dressed in a traditional leopard-skin cloak, because.

28. The image Mandela prefers for himself is that of