单选题 Talks on climate change resumed in the German city of Bonn on July 16 to ______ global warming.
A. foeus on B. combat C. settle down D. sum up

【正确答案】 B
【答案解析】combat战斗，抗击；focus on集中精力于；settle down舒适地坐或躺；习惯于新的生活方式、工作等；sum up形成对某人或某事的看法。