【正文】
ched Middle English.(豐富了的中古英語)The predictions about carbon dioxide and its role in global warming set forth by Arrhenius were virtually ignored for over half a century, until scientists began to detect a disturbing change in atmospheric levels of carbon dioxide.(令人不安的變化)A new ponent system in a fully developed prototype can take as long as four years to incorporate into a new model.(完全得到開發(fā)的樣機(jī))Canned foods are popular because they are already partially prepared and cooked can be stored without refrigeration for long periods, and are generally low in cost.(罐裝食品)As the percentage of older people in the population increases and the size of the working population declines, traditional methods for caring for the old may need to be modified.(工作人員)Scientists who question the global warming trend point to three puzzling differences between the predictions of the global warming models and the actual behavior of the climate/(令人費(fèi)解的費(fèi)解之處)Unit 3 is a never ending task that has to be done at last once every couple of days,if not every day.(即使不用每天). I see it,preschool children who are taught at home by their parents do at least as well as,if not better than(就算做不到更好),those educated at nursery schools. is difficult ,if not important(即使并非不可能),for most people to think otherwise than in the fashion of their own periods.