At the shopping mall, you probably think about spending, not saving. Think about all the water faucets (水龙头) in the toilet. Think about all the air conditioning in summer. Saving energy is a hot topic for such a big place!
Electric lights, infrared (红外感应) faucets and air-conditioners need electricity to work. More and more dust and dirt make the lights less bright. When malls keep lights clean, they can use fewer lights and keep the area just as bright.
You step up to the water faucet. The water starts to flow. You don't have to touch a thing. Why do malls have such fancy faucets? The answer is simple. They save water. Infrared faucets turn themselves off.
A．Many things at the mall use energy.
B．Using fewer lights means using less energy.
C．Sometimes people forget to turn the water off after they wash.
D．Think about all the lights that keep the mall bright.
E．One way to save energy is by keeping lights clean.
