单选题
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.
【正确答案】
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”。