The World Wildlife Fund has declared that global warming, a phenomenon most scientists agree to be caused by human beings in burning fossil fuels, will create havoc among migratory birds by altering the environment in ways harmful to their habitats.


a phenomenon most scientists agree to be caused by human beings in burning fossil fuels,

a phenomenon most scientists agree that is caused by fossil fuels burned by human beings,

a phenomenon that most scientists agree is caused by human beings' burning of fossil fuels,

which most scientists agree on as a phenomenon caused by human beings who burn fossil fuels,

which most scientists agree to be a phenomenon caused by fossil fuels burned by human beings,

考题讲解

题目分析:
本题的划线部分是global warming的同位语或者定语,它的变化并不影响整个句子主干的表达。

选项分析:

A选项:首先我们需要先把这个句型看懂,由于先行词a phenomenon在其身后的定语从句中充当宾语,所以这里省略了引导词that,补全则有:
a phenomenon that most scientists agree to be caused by human beings in burning fossil fuels
在定语从句中,若将先行词代入位置,则有:
most scientists agree a phenomenon to be caused by human beings in burning fossil fuels
在本选项中,引起这个现象的是human beings in burning fossil fuels,这个名词短语中的核心词是human beings。但在逻辑上,真正引起气候变暖的应该是人类焚烧化石能源这个行为,而不是人类本身。
另外,agree A to be B不是正确的表达,应该用agree that A do B。(考查“不定式和从句的区别”,由于agree的约束力较弱,所以必须用宾语从句

B选项:本选项中先行词a phenomenon实际上是做agree的宾语从句中的主语,即:
most scientists agree that a phenomenon is caused by fossil fuels burned by human beings
同(A)理,正引起气候变暖的应该是人类焚烧化石能源这个行为,而不是化石燃料本身。

C选项:Correct. 本选项在语法和逻辑上均是正确。本选项a phenomenon身后的定语从句学名叫嵌入式关系分句

D选项:
cause逻辑主语核心词错误同(A)。

E选项:
cause逻辑主语核心词错误同(B)。

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