5.如果商品富有弹性，厂商想要扩大销售收入，则要提高价格。
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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。
A. 对
B. 错
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
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