题目：
Unemployment due to the time it takes for qualified workers to be matched with existing job openings describes:（）
A. structural unemployment.
B. frictional unemployment.
C. cyclical unemployment.
答案：
参考答案：B
解析：
Structural unemployment is due to structural changes in the economy that eliminate some jobs while generating job openings for which unemployed workers are not qualified. Cyclical unemployment results from short-term deviations from "full employment."
”体现的辩证法道理是（ ）