单选题 —We"ve managed to reduce the energy consumption in our factory by about 15 percent in the last two years.
—That"s excellent. How have you managed that?
—Mainly because we"ve invested in a heat recovery system. We use the exhaust gases from our printing presses to provide energy to heat our dryers.
—Most of our power comes from hydro-electric plants. We"re hoping to use even more energy from alternative sources in the future—perhaps even wind power.