fossil fuels like coal, natural gas and oil to produce energy __4__ byproducts are called “greenhouse” gases, the most important one __5__ (be) carbon dioxide. These gases trap heat from the sun and therefore warm the earth, __6__ which the earth would be about thirty-three degrees Celsius __7__ (cool) than it is. But the increased amount of carbon dioxide means that more heat energy __8__ (trap)

　　in the atmosphere, causing the global temperature to go up. On __9__ other hand, scientists like George Hambley believe that any warming will be mild with few bad environmental consequences and more carbon dioxide is __10__ (actual) a positive thing. 课堂学案 1. subscribe vt. 捐助，捐赠；签署(文件)；签(名)

　　vi. 同意；订阅 1. All scientists subscribe to the view that the increase in the earth’s temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy. 所有科学家都同意这种观点，即地球温度升高是由于燃烧像煤、天然气和石油等化石燃料来制造能量而引起的。 2. Please subscribe your name to the document. 请在文件上签名。 3. Peter subscribed to several newspapers. 彼得订阅了几份报纸。 subscribe to… 订阅 (报纸或杂志)；同意/赞同…… subscribe (one’s name) to sth. 在某物上签名 subscribe money 捐款 【词块助记】 【拓展】subscription n. 订阅；捐献；签署

　　subscriber n. 订户；签署者；捐献者 1. I don’t subscribe to his idea where we will go for a picnic on Sunday. 2. Most of today’s youngsters prefer to subscribe their favorite journals online because they think it is both trendy and handy. Key：1. where改为that　2. 在subscribe后加to 【词块助记】 2. quantity n. 量；数量；数额；数目

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