【题目】在下面一段文字横线处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密。每处不超过17个字。（5分）
全球气候在整个20世纪确实一直在变暖，① ？对此，众说纷纭。有些科学家认为20世纪气候变暖是”小冰期”气温回升的延续，是自然演变的结果，跟”温室效应”无关。但有些人反对这个观点，他们认为，② ，而人类是造成”温室效应”的罪魁祸首。气象系统是十分复杂的，无论地球变暖是否因为”温室效应”，我们都应该加以关注。相信总有一天我们会弄明白地球变暖的来龙去脉，③ 。
【答案】①但气候变暖是不是因为“温室效应”呢②全球气候变暖是因为“温室效应”③从而改善环境，造福人类（写出一句给1分，写出两句给3分，写出三句给5分。意思答对即可。如有其它答案，只要言之成理，可酌情给分。）
【解析】
试题分析：本语段主要表明“全球气候变暖的原因”的几种代表性看法。①句依据后面“有些科学家认为20世纪气候变暖是”小冰期”气温回升的延续，是自然演变的结果，跟”温室效应”无关。”可知要补写的内容应是转折关系，即“但气候变暖是不是因为“温室效应”呢”。②句由前文“有些人反对这个观点”，和后面的内容，即“全球气候变暖是因为‘温室效应’”。③由空前内容和句意，可知应是结论，可填“从而改善环境，造福人类”。
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