17．Rainforests，it turns out，are not created equal．Take the Amazon rainforest，an area that covers about 7million square kilometers．But within that huge expanse are all kinds of ecological zones，and some of these zones，says Greg Asner，are a lot more crowded than others．
"Some forests have many species of trees，"he said，"others have few．Many forests are unique from others in terms of their overall species composition…"And all of these different small areas of forest exist within the giant space that is the Amazon Rainforest．
So Asner，using the signature technique called airborne laser-guided imaging spectroscopy，began to map these different zones from the air．"By mapping the traits of tropical forests from above，"he explains，"we are，for the first time，able to understand how forest composition varies geographically．"
The results show up in multicolored maps，with each color representing different kinds of species，different kinds of trees，the different kinds of chemical they are producing and using，and even the amount of biodiversity，the animal and plant species that live within each zone．
Armed with this information，Asner says decision-makers now have"a first-time way to decide whether any given forest geography is protected well enough or not．If not，then new protections can be put in place to save a given forest from destruction．"
Asner says the information is a great way for decision-makers to develop a"cost-benefit ratio type analysis．"Conservation efforts can be expensive，so armed with this information，government leaders can ensure they are making the most of their conservation dollars by focusing on areas that are the most biologically diverse or unique．
The next step，Asner says，is to take his project global，and to put his eyes even higher in the sky，on orbital satellites．"The technique we developed and applied to map Peru is ready to go global．"Asner said．"We want to put the required instrumentation on an Earth-orbiting satellite，to map the planet every month，which will give the best possible view of how the world's biodiversity is changing，and where to put much needed protections．
25．Unequally-created rainforests refer to the factD．
A．how crowded they are
B．where they are located
C．when they came into being
D．what kinds of species they have
26．What can government leaders learn from Asner's mapping？C
A．The cost to conserve forests
B．The chemicals needing for certain forests
C．The forest areas needing special protection
D．The number of animals living in a forest
27．What is Asner planning to do now？B
A．To send a satellite to map the world
B．To track the change of biodiversity in the world
C．To develop technology for mapping the globe
D．To advertise his project around the world
28．What does the passage mainly talk about？A
A．Using eyes in the sky to map biodiversity
B．Making a map of big forests in the world
C．Learning about the biodiversity of Amazon forest
D．Protecting the forest from being destructed．
分析 本文是一篇新闻报道类阅读，本文叙述了雨林对气候的影响，目前雨林所面临的危机以及如何采取措施拯救雨林．介绍了科研人员通过高科技来测绘雨林中物种的分布，从而能够了解雨林中物种的变化，以及哪些地区的物种需要特殊保护，从而更好地保护雨林资源．
解答 25-28DCBA
25．D．推理判断题．根据第二段"Some forests have many species of trees，others have few．Many forests are unique from others in terms of their overall species composition…"可知之所以说是不平等创造的雨林是因为它们所包含的物种不同．故选D．
26．C．细节理解题．根据第五段"Asner says decision-makers now have"a first-time way to decide whether any given forest geography is protected well enough or not．"可知政府领导人可以知道需要特别保护的森林地区．故选C．
27．B．细节理解题．根据最后一段"We want to put the required instrumentation on an Earth-orbiting satellite，to map the planet every month，which will give the best possible view of how the world's biodiversity is changing，and where to put much needed protections．"可知现在Asner计划追踪世界上生物多样性的变化．故选B．
28．A．主旨大意题．通读全文可知本文主要介绍了科研人员通过高科技来测绘森林中物种的分布，从而能够了解森林中物种的变化，以及哪些地区的物种需要特殊保护，从而更好地保护森林资源．故选A．
点评 此题主要考查学生的细节理解和推理判断能力．做细节理解题时要结合原文和提干有针对性的找出相关语句进行仔细分析，再结合选项选出正确答案．在做推理判断题时不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
