阅读理解判断对(√)错(×)。

     Hello, I am Nina. I go to school from Monday to Friday. We have four classes in the morning and two

in the afternoon. After school, I have many activities. I play ping-pong on Mondays. I play basketball on

Tuesdays. I listen to music on Thursdays. I do my homework in the evening. I often read books and watch

TV on Saturdays. I play computer games on Sundays. I love weekends. How about you?

( ) 1. I have six classes every day from Monday to Friday.

( ) 2. I play ping-pong on Mondays and Tuesdays.

( ) 3. I play basketball on Tuesdays.

( ) 4. I don't go to school on the weekends.

( ) 5. I watch TV on Saturdays.

龙岗天虹商场举办迎新春活动，准备将某商品打折出售．若按标价的七五折出售将亏25元，而按标价的九折出售将赚20元．问这种商品的标价是多少？进价是多少？