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题库 / GMATLA-SC-72
Discussion of greenhouse effects has usually focused on whether the Earth would warm and by how much, but climatologists have indicated all along that the most obvious effects, and those that would have the largest impact on people, would be extremes of temperature, precipitation, and storminess.
the most obvious effects, and those that would have the largest impact on people, would be extremes of temperature, precipitation, and storminess
the effects that are the most obvious ones, extremes of temperature, precipitation, and storminess, would be those impacting the most on people
those effects to have the largest impact on people, extremes of temperature, precipitation, and storminess, are what are the most obvious effects
extremes of temperature, precipitation, and storminess, the most obvious effects, that they would have the largest impact on people
extremes of temperature, precipitation, and storminess, which are the most obvious effects, are those to impact the most on people
试着分析一下，首先要弄清楚intended meaning: 温室气体的讨论集中在全球是否变暖，和变暖的程度。但是气象学家们认为具有最明显的效果，和对人类造成最大影响的却是极端气温、降雨和磁暴。
choice a, 语法和意思均正确
choice b, that宾语从句是一个主系表结构，主语变成了1）具有最明显的效果，2）极端气温，3）降雨，4）磁暴。同时4个名词作主语意思就变了。即便把2）3）4）看作1）的同位语，意思也变了：具有最明显效果的也是对人类影响最大的那些。
choice c, 分析同choice b, 并且effects to have the largest impact不定式作定语是有问题的。常见用不定式作为名词定语的有：way to do sth
choice d, that宾语从句中没有谓语动词，并且第二个that引导完整的句子，并没有可以并列的对象
choice e, which引导的定语从句往前修饰3个并列名词，语法是可以的。但是意思改变了，整个句子表达的意思是1）极端气温2）降雨 3）磁暴是对人类影响最大的。相对于choice a, 信息量减少了
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