高中英语课件-人教版高二英语语法专题--- it 用法.pptx

atmosphere went up from around 315 parts to around 370 parts per million. All scientists accept this date. They also agree that ____ is the burning of more fossil fuels that has resulted in this increase in carbon dioxide. So _____ high will the temperature increase go? Dr Janice Foster says that over the next 100 years the amount of warming could be as low as 1 to 1.5 degree ;Celsius, but it could be as high as 5 degrees. However, the attitude of scientists towards this rise is _______ (complete) different. ____ the one hand, Dr Foster thinks that the trend which increases the temperature by 5 degrees would be a catastrophe. She says," We can't predict the climate well enough _______ (know) what to expect, but it could be very serious." Others who agree with her think there may ;be a rise of several metres in the sea level, or predict severe storms, floods, droughts, famines, the spread of species. On ____ other hand, there are those, like George Hambley, _____ are opposed to this view, believe that we should not worry about high levels of carbon dioxide in the air. They predict that any warming will be mild with few bad environmental consequences . ;___ fact, Hambley states ,"More carbon dioxide is actually a positive thing. It will make plants grow quicker; crops will produce more; it will encourage a greater range of animals - all of which will make life for human beings better." Greenhouse gases continue _______ (build) up in the atmosphere. Even if we start reducing the amount of carbon dioxide and other greenhouse gases,;the climate is going to keep on _____ (warm) for decades or centuries. No one knows the effects of global warming. Does that mean we should do nothing? Or, are the risks too great ?;1. It is never too old to learn. ;2. It is no good crying over spilt milk.;3. It is easier to fall than to rise.;4. It is a poor mouse that has only one hole. ;1. It is never too old to learn. 2. It is no good crying over