【正文】 ities. Their activities have destroyed crops and plants. They pete directly with other wildlife for food and shelter， including taking over burrows (地洞 ) of other animals. They have led to dangerously reduced populations of many plant and animal species. Efforts to control the rabbit population have had mixed success. The first main effort was the RabbitProof Fence. In 1901, the government started building a knee in the state of Western Australia to protect farmland from rabbits. By the time it was finished in 1907, the RabbitProof Fence ran some 2, 000 miles from north to south. The Acting Chief Inspector of Rabbits, Alexander Crawford, headed a team whose job was to go around keeping the fence in working order. But over time, the fence proved to be no match for the rabbits. Other main efforts have included programs to destroy rabbit burrows or use viruses that sicken and kill rabbits. Again, these efforts have been less than successful. The big problem to any efforts to control the rabbit population is simply that their population grows so quickly. One female can have 30 young in a year. If Thomas Austin had known the damage that the rabbits would cause across the country, he might have had second thoughts about bringing rabbits to Australia. 14. Why did rabbits begin to live in Australia? A. They travelled there by chance. B. They were brought in by Thomas Austin. C. They were introduced by the government. D. They moved there to escape bad environment. 15. What is Paragraph 2 mainly about? A. Some activities of rabbits. B. Rabbits? ability to live in the wild. C. How fast the population of rabbits grows. D. The damage rabbits have caused to Australia. 16. How successful was the RabbitProof Fence? A. It failed in the beginning. B. It didn?t live up to expectations. C. It was unfinished for lack of money. D. It failed later for nobody protected it. 17. What would be the best title for the text? A. Rabbits and farming B. Efforts to control rabbits C. Rabbits: experts in burrowing D. Rabbits: unweled newers C Imagine you are on a beautiful tropical beach. The blue water shines in the sun, and the sand is warm under your feet. You notice a small fruit in the sand. It looks like a little green apple. You pick it up and smell it… it smells sweet. But whatever you do. Don?t take a bite! This is the fruit of the manchineel tree. It is the most poisonous tree in America. You can find it in Florida, as well as in the Caribbean, Mexico, and Central America. If you were to eat the fruit, it would taste delicious. But then your mouth would start to burn. Your throat would tighten and make it difficult to breathe. You could even die. The fruit isn?t the only risky part of the manchineel tree. The tree is full of milky white sap. Sap is a liquid that flows through a plant, like blood flows through a person. The manchineel?s sap is hazardous. If it gets on your skin, it will cause painful blisters. So don?t try to cut down these trees, because you could get sap all over you! And if you try to burn manchineel wood, the smoke will choke and blind you. Manchineel trees are dangerous, but they?re also an important part of the environments where they grow. Manchineels protect beaches with their strong roots. The roots help stop sand and soil from washing away. This is good for the plants, animals, and people living nearby. There aren?t many manchineel trees left in the world. So even though they?re harmful, people are trying to protect them. Still, if you see one, stay away! 18. What do we know about the manchineel tree? A. It looks ugly. B. Its fruit is dangerous. C. Its fruit tastes terrible. D. It grows in cool places. 19. What does the