To the scientists' delight, their efforts have increased people's ______ of the importance of saving water.
 
【正确答案】 A
【答案解析】 考查名词辨析。句意为“让科学家们高兴的是,他们的努力增加了人们的节约用水的______”。awareness“意识”,commitment“承诺”,agreement“合同,同意”,response“回应”。根据题意,只有A项符合逻辑。故选A。