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大气中的二氧化碳浓度增加后带来的直接影响是气温上升。有专家估计，到21世纪末，全球气温将比现在增加2℃～5℃，会导致海平面上升。据此回答1～2题。 1．二氧化碳被称为“保温气体”，是因为二氧化碳能 [     ] A．吸收太阳辐射，使大气增温 B．破坏臭氧层，使到达地面的紫外线增多 C．强烈吸收地面长波辐射 D．通过化学反应向大气释放热能 2．如果全球气温持续这样的变化趋势，我国将来最有可能出现的地理现象是 [     ] A．天山的雪线将下降 B．鄱阳湖水面将上升 C．亚热带与暖温带之间的界线将北移 D．一月0℃等温线将南移
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