单选题 According to the latest report, consumer confidence ______ a breathtaking 15 points last month, to its lowest level in 9 years.
A. soared B. mutated C. plummeted D. fluctuated

【正确答案】 C

【答案解析】[解析] 本题空格处讲的是“上个月惊人地降了15点”。plummet的意思是“垂直下落”，如：The damaged aircraft plummeted down to earth．损坏的飞机垂直坠落于地上。soar的意思是“剧增”；mutate的意思是“改变”；fluctuate的意思是“波动”。可见只有C项符合题意。