Q 23: 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 larg- est 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 temper- ature, 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 这题我选了e,答案是a,不太明白这个句子的结构,在述说一个什么事情 | 
