题目：
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
答案：
参考答案：C
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 clown to ealth. 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。
