Andrew Holleman, a 12-year-old boy, loved playing in the open land near his home. The land was wet and forested, and made a home for the birds, other animals and many different plants. It made the perfect place for him to study and get to know the nature. He had seen some red-tailed hawks, red foxes, wood turtles and other animals. He also found special native flowers. Suddenly it was announced that the “ empty” land would be improved by a lot of houses on it. The plants would be removed, the animals would run away and most would probably die. Then the wet soil(土壤)would be covered with extra grounds. When he heard about the news, he was not happy. He was very worried that the land and water would be polluted. Andrew wrote down clearly all the research he had done about the area, and how the houses would affect(影响)the local environment. He sent letters to members of local government and television reporters. He also called on his neighbors to oppose the building of the houses. Although he was only 12 years old, he had the courage and wisdom of a person much older. Andrew9s teachers described him as gentle, shy and active. His classmates also admired how much he knew about local animals and plants, and the environment. Each day after school, Andrew went door-to-door，to ask the people to sign (签名)，who did not want the houses to be built. In only one month, he got the signatures of 250 people. In the end, the land remained a safe place for birds, animals and plants that belonged there. Andrew won many prizes for his brave and great work to stop the houses being built, and thus help save the environment. 51. The passage is mainly about 　 　 . A. 250 people who signed to help Andrew B. a brave boy who cared for the environment C. the open land that suited animals and plants D. the research of improving the environment 52. The underlined word “oppose” in the passage probably means 　 　 . A. support B. dislike C. disagree D. prefer 53. Andrew was very worried because 　 　 . A. the animals would be killed B. new houses would be built on the open land C. not all the neighbors were going to sign D. the local government made a right decision 54. According to the passage, Andrew 　 　 . A. was good at going door-to-door B. got in no touch with the reporters C. usually acted like a person much older D. was praised by his teachers and classmates 55. We can infer (推测)that 　 　 . A. the land would remain as it used to be B. the open land would be built into a park C. the neighbors would have to move away D. Andrew would soon work for the government