《诗经-卫风木瓜》中写道：“投我以木瓜，报之以琼琚。匪报也，永以为好也。”请问这句诗引用了哪个成语？
参考答案：这句诗引用的成语是投木报琼。
下面哪个功能不在电费计算模块中（）
A、电费计算
B、电费发行
C、手工退补发行
D、现金冲正
Kristen Chandler, CFA, has been doing research about different types of goods. Which of the following goods has a positively sloped demand curve as a result of the negative income effect overweighting the positive substitution effect（）
A. Veblen.
B. Giffen.
C. Inferior.
