Read the following passage and choose the best answers.

In biology and ecology the environment is all of the natural materials and living things on the Earth. This is also called the natural environment. Some people call themselves environmentalists. These people think that harmony with the environment is important. They think we must protect the environment. The important things in the environment that we value are called natural resources. For example fish, sunlight, and forests. These are renewable natural resources because they grow naturally when we use them. Non-renewable natural resources are important things in the environment that do not come back naturally. For example coal and natural gas.

36.What does the world “environmentalists” in line 2 mean?

             A. living things                                                       B. people who protect the environment

             C. people who destroy the environment             D. people who pollute the environment

37.One example of renewable natural resources is……….

             A. sunlight                    B. coal                               C. oil                                    D. natural gas

38.One example of non-renewable natural resources is………….

             A. fish                           B. tree                                C. water                               D. coal

39.All of the following things are renewable natural resources except……….

             A. air                             B. gas                                 C. silver                               D. animal

40.What does the word “them” in line 6 refer to?

             A. materials                                                             B. environmentalists

             C. renewable natural resources                            D. non-renewable natural resources