完形填空。 Today the problem of environment has become more and more serious. Every day, every hour, the air, forests, soil, oceans and fresh 1 are becoming dirtier and dirtier. There are two 2 for the problem: the excessive (过度) use of natural resources and pouring a lot of 3 waste in the course of production. Yet, man 4 great progress in environmental protection. Scientists and inventors are trying to develop 5 engines for automobiles. Governments of many countries have made 6 to protect the natural resources. More and more people have realized the importance of environmental protection and are doing what they can to protect our surroundings. Still more ways 7 to solve the problem. People should be educated in 8 modern methods to protect the environment and learn to make clever use of recycling our natural resources. The government of all 9 should take ways to fight against pollution _ 10 _ protecting the environment is not only protecting our home but also the civilization (文明) of the humankind. (     ) 1. A. water (     ) 2. A. ways (     ) 3. A. pollution (     ) 4. A. makes (     ) 5. A. cleaner (     ) 6. A. ways (     ) 7. A. should take (     ) 8. A. using (     ) 9. A. schools (     ) 10. A. so B. air B. reasons B. polluted B. made B. dirtier B. laws B. taking B. taking B. cities B. because C. food C. things C. polluting C.  has made C. Worse C. rules C. should be taken C. having C. countries C. because of