問題詳情

四、長篇閱讀(第 41–50 題)Over time periods of thousands of years, the Earth goes through a natural cycle of warmerand colder periods, driven by changes in heat coming from the Sun. Professor WilliamRuddiman has now calculated that if the Earth had followed its natural cycle over the last tenthousand years, it ought to have got steadily colder. It hasn’t because, he believes, humanactivities have been keeping the temperature steady.“What should have happened with the natural climate is it should have cooledsubstantially. And instead humans just started adding greenhouse gases to the atmosphere at arate which cancelled most, but not quite all, of that natural cooling; and so it’s a combination ofa natural cooling mostly cancelled by a human warming.”Our ancestors started adding the greenhouse gas carbon dioxide principally by cuttingdown trees for farming; whereas methane production started with wet farming of rice. ProfessorRuddiman believes this ten-thousand year warming added almost a degree Celsius to theaverage temperature.
41.What is the most appropriate topic of this essay?
(A) Climate Change
(B) Natural Climate
(C) Greenhouse Gas
(D) Wet Farming

參考答案

答案：A
難度：非常簡單1
統計：A(2),B(0),C(0),D(0),E(0)

內容推薦

內容推薦