请阅读下面的非连续性文本，根据语篇内容，回答问题。

Footprint means the influence that a person’s or organization’s activities have on the environment. Simply understanding it is very useful to us. (Let’s take the example of Mr. Brown’s footprints.)

Water footprint

Water is the source of life. We use water directly for drinking, cooking and washing, but we also use water indirectly for producing things such as food, paper and cloth. A water footprint tells us how much water is being used. It can help us come up with ways to save water. You can learn about how your daily habits influence your water use through the food you eat, the things you buy and even the energy you use.

(Chart I) (Chart Ⅱ)

Carbon( 碳 ) footprint

A carbon footprint is the total amount of CO₂ a person or organization produces. We can use it to understand the influence of personal behavior on global warming ( 全球变暖 ). Most people are surprised when they see how much CO₂ their activities create. Then they begin to think about changing their daily habits to reduce( 减少 ) their carbon footprints. For example, they can walk instead of using a car.

(Chart III) (Chart IV)

How to reduce your water footprint and carbon footprint to be greener

Tip 1: Save water and electricityWhen you are at home, don’t leave the water or lights on when you don’t need it.

Tip2: __ ▲ __

Meatless Monday is popular with people who want to eat less meat. The production of meat uses lots of energy and produces lots of CO₂.

Tip 3: Buy less

The more we buy, the more we throw away later. Before you buy something, think about whether you really need it.

Everyone plays a role in making a greener Earth. If you know about your footprints well, you can think up more ways to protect the environment.

24 ． What do we use water indirectly for?

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25 ． How many litres of water are used for Mr. Brown’s breakfast?

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26 ． Why do we use carbon footprint?

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27 ． What can Mr. Brown do to reduce his carbon footprint? Why do you think so?

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28 ． What is the best subtitle( 小标题 ) of Tip 2?

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29 ． What’s your understanding of footprint? How can you become “greener”?

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答案

(We use it indirectly for) producing things (such as food, paper and cloth).    25 ． 2,540 (litres of water are used for it).    26 ． (We use it) to understand the influence of personal behavior on global warming./Because it helps us understand the influence of personal behavior on global warming./It helps us think about changing our daily habits to stop global warming/reduce our carbon footprints./...    27 ． He can take the bus to work/share a car with his workmates/take a reusable bag while shopping./...(Because I think) it helps produce less CO₂/reduce greenhouse gases/create a lower/smaller carbon footprint./...    28 ． Eat less meat/Eat meat less    29 ． It can help me think up ways to protect the environment./It’s a useful tool for me to understand the influence that my daily habits have on the environment./... I can walk to school./By ordering less while eating out./I can recycle things as much as possible./...

【导语】本文是一篇说明文，以布朗先生为例，介绍水足迹、碳足迹，并呼吁我们保护环境。

24 ．根据 “but we also use water indirectly for producing things such as food, paper and cloth” 可知，我们也间接地使用水生产东西，如食物，纸和布。故填 (We use it indirectly for) producing things (such as food, paper and cloth).

25 ．根据 Chart I 和 Chart Ⅱ 可知， a hamburger 2,400 litres ， a cup of coffee 140 litres ，所以早餐是 2,540 litres 。故填 2,540 (litres of water are used for it).

26 ．根据 “We can use it to understand the influence of personal behavior on global warming ( 全球变暖 ).” 可知，我们可以用碳足迹来了解个人行为对全球变暖的影响，故填 (We use it) to understand the influence of personal behavior on global warming./Because it helps us understand the influence of personal behavior on global warming./It helps us think about changing our daily habits to stop global warming/reduce our carbon footprints./...

27 ．本题属于开放性试题，言之有理即可，开车会产生二氧化碳，所以布朗先生可以坐公交或者和同事一起搭车，塑料袋对环境有害，所以可以带一个环保袋去购物。因为环保的方式可以减少二氧化碳、温室气体的排放，产生更少的碳足迹。故填 He can take the bus to work/share a car with his workmates/take a reusable bag while shopping./...(Because I think) it helps produce less CO₂/reduce greenhouse gases/create a lower/smaller carbon footprint./...

28 ．根据 “Meatless Monday is popular with people who want to eat less meat. The production of meat uses lots of energy and produces lots of CO₂.” 可知， “ 无肉星期一 ” 很受那些想少吃肉的人的欢迎。 生产肉类需要消耗大量的能源，并产生大量的二氧化碳。所以 “ 少吃肉 ” 可以作为本段的标题，故填 Eat less meat/Eat meat less 。

29 ．本题属于开放性试题，言之有理即可，参考答案： It can help me think up ways to protect the environment./It’s a useful tool for me to understand the influence that my daily habits have on the environment./...I can walk to school./By ordering less while eating out./I can recycle things as much as possible./...