新修订的《中华人民共和国消费者权益保护法》提出了对“网购一族”予以“七天无理由退货”的法律保护。这表明保护消费者合法权益做到了( )
A:严格执法
B:公正司法
C:有法可依
D:依法办事
A concert will be held ________ the world-famous musician, who will personally play his favourtie music at it.
若x=2012,则代数式x2-2x+1x2-1÷x-1x2+x的值为( )