The problem of global warming is serious. , the sea levels have a little.
A. As a consequence; risen
B. On the contrary; arisen
C. On the other hand; arisen
D. In other words; risen
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(答案→)A. As a consequence; risen
B. On the contrary; arisen
C. On the other hand; arisen
D. In other words; risen
解析：固定词组。As a consequence结果是；On the contrary恰恰相反；On the other hand另一方面；In other words换句话说；rise上升；arise上升，出现；句意：全球变暖问题变得更严重了。结果海平面上升了一点了。