【GMAT】The World Wildlife Fund has declared that global warming, a phenomenon that most scientists agree is caused by human beings’ burning of fossil fuels, will create havoc among migratory birds by harming their habitats as a result of altering the environment
老师这道题看了答案也不太理解
The World Wildlife Fund has declared that global warming, a phenomenon that most scientists agree is caused by human beings’ burning of fossil fuels, will create havoc among migratory birds by harming their habitats as a result of altering the environment.
（OG19 V 232）
A by harming their habitats as a result of altering the environment
B by altering the environment to the extent of it harming their habitats
C by altering the environment in ways harmful to their habitats
D from the fact that their habitats will be harmed by the environment being altered
E from the fact that the environment will be altered and this will harm their habitats
划线前面的内容是说，影响迁徙的鸟类。划线部分说了两个事情，需要辨析的是这两个事情由于内容所决定的成分作用；
① 破坏鸟的栖息地 ② 改变自然环境；
—— 问：这两个概念到底是因果联系？时间先后联系？范畴包含关系？
改变自然环境是一个大范畴的概念，而鸟的栖息地仅仅是“自然环境被改变”之下的一个子集范畴；
所以主语global warming改变的是自然环境，在此之下，鸟类迁徙的栖息地受到影响；
A 选项：by后面跟的是直接原因，而as a result of后面跟的是时间顺序排列在前的事件；严格意义上讲，逻辑是说得过去的，但是“全球气候变暖”直接导致的是自然变化，而鸟存在的栖息地是“大自然”的一小部分；
B extent这个词很扎眼，暗示对自然的影响达到一定程度，才会对鸟类栖息地有破坏，句中没有对extent有做程度上的提示； it没有指代对象；
C 全球气候变暖——改变自然环境——对鸟有影响
D E from the fact that / being 都是累赘
Answer：C
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