A
KEY→P3
范畴:人与自然 主题:奥秘探索 体裁:应用文 难度:★★★ 建议用时:5分钟 评价:/3
新模态 操作指南

()1. What are the conditions for a rainbow to form in nature?
A. Water and fog. B. Clouds and sunlight.
C. Sunlight and water drops. D. White paper and sunlight.
()2. Rainbows DON'T have the color .
A. red B. yellow C. green D. black
()3. In which class are you most likely to do this experiment?
A. In a Math class. B. In a Physics class.
C. In an English class. D. In a Chemistry class.

本材料介绍了自己动手制作彩虹的实验。
1. C 细节理解题。由Rainbows form in the sky when sunlight is refracted as it passes through raindrops可知，彩虹的形成需要具备的两个条件是阳光与水滴。
2. D 细节理解题。根据“into the colors red, orange, yellow, green, blue, indigo and violet”可知答案。
3. B 推理判断题。本文介绍制作彩虹的实验过程，由全文及常识可知，彩虹的形成涉及光的折射现象，这是物理知识，因此最有可能在物理课上做这个实验。

B
KEY→P3
范畴:人与自然 主题:环境保护 体裁:说明文 难度:★★★★ 建议用时:7分钟 评价:/4
Have you wondered what happens to all the hot water that you use in your homes for showers or washing dishes? The water goes into our city's sewage system.
Now imagine using the waste heat and recovered energy to heat and cool buildings. Known as sewer energy, this unconventional source of energy may be at the forefront of the future clean energy change.

Cities are realizing that wastewater is a valuable source of heat energy. It can be used and processed in treatment plants to power homes up. One report says that American cities lose about 350 billion kilowatt-hours of waste energy—enough to power about 30 million homes up!
As the city of Denver in Colorado begins to take the lead in the project of using sewer energy, many cities are following and employing this eco-friendly source of energy.
Using sewer energy may be a simpler process than you thought. In Denver, work has already started on the construction of a wastewater energy retrieval(取回) plant.
A large pit in the new facility contains the main sewer line, through which the wastewater flows at a constant temperature. A large heat pump will transfer the heat from the wastewater to a clean-water loop that is pumped to buildings around the city. The recovered energy can be used to heat water and indoor space in buildings.
Since the sewage is always kept at a fairly constant temperature, much like the energy from the Earth used by geothermal systems, it takes much less energy to heat the water up than to heat cold water up. This eco-friendly method also makes use of wastewater that will do harm to local wildlife if it is released directly into river systems.
However, there are also some problems. Such a system functions best when used in districts that have central heating and cooling systems. Experts say careful planning is necessary when deciding how to implement the sewer recovery system.
Using energy from wastewater is certainly a special method of powering homes up, but in just a few years, it may prove to be one of the key players in the energy industry.
()1. Where does the wastewater come from according to the passage?
A. Factories. B. The sea. C. Our homes. D. Hot weather.
()2. What does Denver in Colorado take the lead in?
A. Powering homes up for free. B. Offering homes hot water.
C. Trying to clean wastewater. D. Using wastewater to power homes up.
()3. What can we guess from the last paragraph?
A. It's not easy to use energy from wastewater.
B. Energy from wastewater will be widely used.
C. Most homes are using energy from wastewater.
D. Few homes would like energy from wastewater.
()4. What is the passage mainly about?
A. The future life. B. Sewer energy.
C. The heating system. D. The city of Denver.

你是否想知道家中用于淋浴或洗碗的所有热水都去哪里了？废水会进入城市污水系统，待处理后为家庭供电。随着美国科罗拉多州丹佛市在下水道能源项目中起带头作用，许多城市都在效仿并应用这种环保能源。
1. C 细节理解题。由第一段中“Have you wondered what happens to all the hot water that you use in your homes for showers or washing dishes?”可知，本文提及的废水来自人们的家里。
2. D 细节理解题。由第四段中“As the city of Denver in Colorado begins to take the lead in the project of using sewer energy ...”可知，丹佛市在使用下水道能源方面领先。
3. B 推理判断题。由最后一段中“but in just a few years, it may prove to be one of the key players in the energy industry”可推知，废水转换的能源将被广泛应用。
4. B 主旨大意题。通读全文可知，本文主要介绍的是下水道能源。