The underlined sentence “Put your heart into your singing in the last paragraph means “ . A. devoting yourself to singing B. taking trouble to sing C. singing happily D. trying your best to sing B Turning Waste in to Energy Every day rubbish could provide a valuable source of energy thanks to a clever new invention. Smelly methanegas expelled from land fill sites containing tones of rotting house hold waste that could be used to produce a valuable energy resource. In Europe a lone land fill tips can produce 94 billion cubic meters of methane per ear, but currently only one percent of what could be a valuable source of energy is used, the rest is burnt off to prevent an explosive build-up of gas. Methane gas forms when organic matter breaks down and is drawn off from large rubbish tips by pipes sunk into the middle of the waste. Until now this process wasn’t possible on small sites because the pipes allowed oxygen to seepin and that stopped the break down process. Viktor Popov of the Wessex Institute of Technology has now developed a system to modify exist in gland fill sites by making them airtight while the methane is extracted from sunken wells. The site is covered by a special three-layered skin whose two outer layers are made of clay with a pressurized layer of carbon dioxide gas in the middle. As the methane is sucked out through a central well, it is replaced by carbon dioxide from the middle layer rather than oxygen, allowing the break down process to continue. Unfortunately, there are no plans to use the power of methane even though Popov claims his invention could provide a valuable source of energy over the next 20 years. 【查看更多】
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Lisa would rather_______ at home than_______ to the cinema .
