6.已知某商品的收入弹性大于0小于1，则该商品是低档商品。
查看答案
7.已知某两种商品的需求交叉弹性小于零，则这两种商品是独立品。
A. 对
B. 错
He was _____ to listen to her parents whatever he wanted to do.
A. absorbed
B. interested
C. obliged
D. exciting
I got serious about this only recently when I _____ one of my former students the other day.
A. ran into
B. went up
C. looked after
D. came to
As soon as I saw her, I asked, "How was it?", full of ______ anticipation.
A. oddity
B. earnest
C. excursion
D. heaven
微信支付 
支付宝支付