第13题: [单项选择]Dozens of scientific groups all over the world have been ______ the goal of a practical and economic way to use sunlight to split water molecules. A. pursuing B. chasing C. reaching D. winning 参考答案:A 答案解析:[解析] A项pursuing意为“追求,寻求”,与goal搭配;B项chasing意为“追逐,追赶”;C项reaching意为“达到”;D项winning意为“赢得”。