8：30；13：30；18：30
一个等腰三角形的其中一条腰长是y厘米，底边是x厘米，那么这个等腰三角形的周长是______厘米．
What’s the difference between Wal-Mart in China and in USA().
A. It’s not big.
B. Trust-Mart is a branch of Wal-Mart.
C. Wal-Mart permits labor unions into its stores.
D. Wal-Mart is loath to give discounts.
