题目内容：

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

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.  ___1.   Groundwater does not come from lakes or rivers. It comes from underground. The more roads and parking lots we pave, the less water can flow into the ground to become groundwater.

2.   Drier climates are of course more likely to have droughts（干旱）than areas with more rainfall, but, in any case, good management can help to make sure there is enough water to meet our basic needs.

3.   In the United States, a family of four can use 1.5 tons of water a day! This shows how much we depend on water to live, but there’s a lot we can do to lower the number.

4.  To start with, use the same glass for your drinking water all day. Wash it only once a day. Run your dishwasher (洗碗机) only when it is full.   5.     You can even help to keep our water supply clean by recycling (回收) batteries instead of throwing them away.

A. Human activity is not responsible for all water shortages.

B. Help your parents fix any leaks (漏水的地方) in your home.

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

D. Some measures to save water should be taken by the government.

E. A major part of the water we use every day is the water from lakes or rivers.

F. A major part of the water we use every day is ground water.

G. You can take steps to save water in your home.