[典例2]　[2017·安徽高考]Using too much water or throwing rubbish into our rivers are clear ways that humans can put our water supply in danger, but we also affect our water supply in less obvious ways. You may wonder how paving(铺砌) a road can lead to less useable fresh water. A major part of the water we use every day is groundwater...

　　Human activity is not responsible for all water shortages (短缺)．..

　　Thinking about the way we use water every day can make a big difference,

　　too...

　　You can take steps to save water in your home. To start with，use

　　the same glass for your drinking water all day...

　　63. The text is mainly about________.

　　A. why paving roads reduces our water

　　B. how much we depend on water to live

　　C. why droughts occur more in dry climates

　　D. how human activity affects our water supply

　　[解析]　D。本文为议论文。文章讨论的是人类活动对水供应的隐形影响。故D项最能概括本文主旨。A、B、C项是文中提到的细节内容。

　　[典例3]　[2017·天津高考]Poet William Stafford once said that we are defined more by the detours(绕行路)in life than by the narrow road toward goals. I like this image. But it was quite by accident that I discovered the deep meaning of his words.

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