51. What is catching environmentalists' attention nowadays?
- A. Rich countries are stripping poor ones of their resources.
- B. Forests are fast shrinking in many developing countries.
- C. Forests are eating away the fertile farmland worldwide.
- D. Rich countries are doing little to address deforestation.
答案：B
答案句：Forests in countries like Brazil and the Congo get a lot of attention from environmentalists, and it is easy to see why. South America and sub-Saharan Africa are experiencing deforestation on an enormous scale: every year almost 5 million hectares are lost.
参考译文：巴西和刚果等国家的森林受到环保主义者的广泛关注，原因显而易见。南美洲和撒哈拉以南非洲地区正经历大规模森林砍伐：每年几乎有500万公顷的森林消失。
定位线索：题干“What is catching environmentalists' attention nowadays”→答案句取自第1段“Forests in countries like Brazil and the Congo get a lot of attention from environmentalists”；文中“deforestation on an enormous scale”对应选项B“Forests are fast shrinking in many developing countries”。
解析：题干问环保主义者现在关注什么，答案句明确指出巴西和刚果等国家的森林受到关注，并解释原因是南美洲和撒哈拉以南非洲（即发展中国家）正经历大规模森林砍伐。选项B“Forests are fast shrinking in many developing countries”是对“deforestation on an enormous scale”的同义转述。选项A“富国剥夺穷国资源”、C“森林吞噬全球肥沃农田”、D“富国对砍伐无所作为”均无原文依据，属于无中生有。
54. What accounts for our increasing desire for forests?
- A. Their unique scenic beauty.
- B. Their use as fruit plantations.
- C. Their capability of improving air quality.
- D. Their stable supply of building materials.
答案：C
答案句：Nowadays forests are increasingly welcome because they suck in carbon pollution from the air. The justifications change, the desire for more trees remains constant.
参考译文：如今森林越来越受欢迎，因为它们吸收空气中的碳污染。理由在变，但对更多树木的渴望保持不变。
定位线索：题干“What accounts for our increasing desire for forests”→答案句取自第3段“the desire for more trees remains constant”和“because they suck in carbon pollution from the air”；文中“suck in carbon pollution”对应选项C“Their capability of improving air quality”。
解析：题干问我们对森林日益增长的需求的原因，答案句明确指出森林“吸收空气中的碳污染”，即改善空气质量。选项C“Their capability of improving air quality”是对“suck in carbon pollution from the air”的同义转述。选项A“独特风景”、B“水果种植”、D“稳定建材供应”均无原文依据，属于无中生有。