双曲线C： $\frac{x^2}{8}-\frac{y^2}{4}=1$ 的离心率为____；渐近线的方程为____．

①实施兼并重组，扩大企业规模         
②完善组织结构，提高运行效率

③提升管理水平，推动服务升级         
④以市场为导向，满足消费需求

在达到平衡的生态系统中，生物数量将会（　　）

放学路上，几位同学看到一位右腿残疾的同学一瘸一拐地走着，便学他的样子走路，引来其他同学大笑，那位残疾同学非常难过。小林见状，气愤地说：“如果你们是那位同学，你们会有什么感受？”小林同学的做法体现了（      ）

①换位思考，与人为善          ②故作高尚，其实和大家一样

③理解至上，善待他人          ④尊重他人，自觉维护弱势群体的尊严

    Potato chips are Americans' favorite snacks(零食). Where do potato chips come from? In 1853 a native(本土) American named George Crum made the first potato chips. Crum was a chide(头目) in an expensive restaurant in Saratogasprings， New York. One day， a customer(顾客) did not like the French fries. He said they were too thick(厚的). So Crum made more， this time thinner. The customer still didn't like them. Crum got unhappy. He decided to make the customer angry. So he cut the potatoes， very thin. The customer loved them.

    Other people wanted Crum's  potato chips. Now， there was a new food on the menu— Saratoga chips. Soon Crum opened his own restaurant and made his special chips.

    It took a long time to make potato chips. People peeled the potatoes by hand. Then in 1920，the automatic(自动的) potato peeler changed everything. Now it was faster and easier to make potato chips. Now potato chips were not a specialty. They were a popular snack food， but only in the north.

    A salesman named Herman Lay wanted to sell potato chips in the south. He sold potato chips in bags. His business grew. Today， Americans eat a lot of potato chips every day.