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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.

                                     Erosion in America

Erosion of America's farmland by wind and water has been a problem since settlers first put the prairies and grasslands under the plow in the nineteenth century. By the 1930s, (1) .  .  .  .   .  .  .  282 million acres of farmland (2).   .   .   .   .    .  by erosion. After 40 years of (3). . . . . . . efforts, soil erosion has accelerated due to new demands (4) . . . . . . . . .on the land by heavy crop pollution. In the years ahead, soil erosion and the pollution problems it causes are likely to replace petroleum scarcity as the nation's most critical nation resource problem.

            1.

            A. more than                                    

            B. more   

            C. less     

            D. than

                2.

                 A. damaged                                 

                 B. damaging                               

                 C. were damaged                        

                 D. damages

                 3.

                 A. conserve                                 

                 B. conservation                           

                 C. conserving                              

                 D. conservations

                 4.

                 A.  placing                                

                 B.  places                                  

                 C. which placed                          

                 D. placed


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