注意：此部分試題請(qǐng)?jiān)诖痤}卡2上作答。
47．Most factors in warming，such as atmospheric carbon dioxide levels and the brightness of thesun，etc.，seem have _______between nowadays and in the Pliocene era．
48．What is the speculation on global warming raised by scientists along time ago?
49．The new paper published in Nature suggests that hurricanes have areversed effect on__________．
50．In the modern worl&E1 Nino often makeschanges in storms and other weather effects as well as brings _______
51．It is ________triggered by El Nino that couldcreate long-lasting warming．