答案　B

　　解析　细节理解题。根据第三段可知，南美地区林木覆盖率最高，其次是撒哈拉以南的非洲，随后是东南亚，而北非和西亚地区林木覆盖率最低。

　　4．In Dennis Garrity’s opinion，

　　.

　　A．most farmers care about nothing but their own interests

　　B．there are usually few people living in areas with few trees

　　C．government plays a small role in tree planting and protection

　　D．government should support farmers in planting and protecting trees

　　答案　D

　　解析　推理判断题。根据第五段可知，Dennis Garrity认为农民们正在自发保护和种植树木，而问题出在政策制定者和计划者身上，他们在认识和支持这些努力方面比较滞后。因此， Dennis Garrity认为政府应当对农民植树和保护树木的积极性给予支持和保护。

　　B

　　People without homes have always been present in America.In the past，they were called hobos，bums，or drifters.It was not until the early 1980s that these people received a new name，when activists named them the homeless.

　　The types of people who were homeless also changed in the 1980s.No longer were they primarily older men.They were younger，with an average age of 35.Their numbers consisted of women，children，adolescents and entire families.They were of many races and cultures.No longer were they only in the inner city.They lived in rural areas and in large and small cities.No longer were they invisible to the people with homes and jobs.The homeless of the 1980s lived in packing crates (装货箱) and doorways.They slept on sidewalks and in public parks.They begged money from passers­by.

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