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.

A.   the most obvious effects, and those that would have the largest impact on people, would be extremes of temperature, precipitation, and storminess

B.      the effects that are the most obvious ones, extremes of temperature, precipitation, and storminess, would be those impacting the most on people

C.      those effects to have the largest impact on people, extremes of temperature, precipitation, and storminess, are what are the most obvious effects

D.      extremes of temperature, precipitation, and storminess, the most obvious effects, that they would have the largest impact on people

E.       extremes of temperature, precipitation, and storminess, which are the most obvious effects, are those to impact the most on people

答案是A，我想问的是E的错误是不是在于impact the most的用法，我选了E，一直找不出E里有什么问题。。。请指教！

E的WHICH有问题, 不知道指代谁?后面的ARE,连的主语不是很清晰,假设是EXTREMES的话,完全没有意义

我选了A.是因为我觉得A表达的很妥当.EFFECTS +从句+WOULD BE 很MAKE SENSE.

我现在的官方语法知识有限,是按照我的感觉来解释的.

E 我觉得which 没什么问题,就是指extents

错在第一无理由改变了时态

    第二：原句的机构是A and B would be C

             E的结构是C which are A, are B

          意思和重心都改变了...

and B,

是对A的修饰,我倒这么认为?!