26. According to the author, most students .

　　A) believe the world’s environment is in an undesirable condition

　　B) agree that the environment of the world is not as bad as it is thought to be

　　C) get high marks for their good knowledge of the world’s environment

　　D) appear somewhat unconcerned about the state of the world’s environment

　　27. The huge increase in world production and population .

　　A) has made the world a worse place to live in B) has had a positive influence on the environment

　　C) has not significantly affected the environment D) has made the world a dangerous place to live in

　　28. One of the reasons why the long-term trend of prices has been downwards is that .

　　A) technological innovation can promote social stability

　　B) political instability will cause consumption to drop

　　C) new farming and crop technology can lead to overproduction

　　D) new sources are always becoming available

　　29. Fish resources are diminishing because .

　　A) no new substitutes can be found in large quantities

　　B) they are not owned by any particular entity

　　C) improper methods of fishing have ruined the fishing grounds

　　D) water pollution is extremely serious

　　30. The primary solution to environmental problems is .

　　A) to allow market forces to operate properly B) to curb consumption of natural resources

　　C) to limit the growth of the world population D) to avoid fluctuations in prices