答案:D A B A C
題目分析
1. 答案為D,屬猜詞題。從句子"it appears that increased air pollution during those 30 years - over Asia, in particular - with the help, perhaps, of some increased cloudiness, may have exerted a cooling influence on the surface of the planet even as carbon dioxide and other greenhouse gases were encouraging the atmosphere to warm."我們可看出一方面空氣污染物及其形成的云星對地球表面有一種冷卻作用,另一方面二氧化碳和其它溫室氣體卻促使大氣變暖。這是一種相互作用,一方強,另一方就弱,就像是"拔河賽"。文章最后一段的一句話"They are just beginning to grapple with the problem of how global warming and solar dimming interact."可以進一步印證我們的這一判斷。
2. 答案為A,屬情感態度。原文對應信息是"no task could be more urgent"。注意含有比較級的否定式的理解,這句話的意思是"This task is the most urgent."從這句話我們可看出氣候學家們對待此事的態度。
3. 答案為B,屬推理判斷題。文章最后一段的中心思想是:對太陽變暗這一問題的研究還只是剛剛開始,還有很多東西我們不了解。然歐以拉曼納森(Ramanathan)的話結束全文。就此我們可以判斷拉曼納森的話也應該是符合這段文章的中心大意的。
4.答案為A,屬事實細節題。原文對應信息是"it appears that increased air pollution during those 30 year - over Asia, in particular - with the help, perhaps, of some increased cloudiness, may have exerted a cooling influence on the surface of the planet"。這句話的意思是"全球--特別是亞洲--不斷加劇的大氣污染,借助數量有所增加的云度可能對整個地球表面起了一種冷卻作用",而在形成云層的過程中由于"the cloud droplets that form are too small and never become weighty enough to fall to the ground"(所形成的云狀水滴顯得又太小,永遠達不到足以落到地面的重量),所以這些云層無法變成雨滴落在地面,而是停留在大氣層,從而對大氣層起到一種冷卻作用。選項A是這種現象所造成的結果。
5.答案為C,屬推理判斷題。文章最后一段提出對太陽變暗這一問題的研究還只是剛剛開始,還有很多東西我們不了解。由此我們可做出判斷。