世界上凡是计算机集中的地方，例如企业、机关、某些居民小区等，大都已经把自己的计算机联在一起了．这些网络又互相联结，成为世界上最大的计算机网络，叫做____ ．

    There has been w recent I ret id in the food service industry toward lower fat content and less sail. This trend, which was stalled by the medical community (医学界____． a method of fighting heart has disease, has bad some unintended side ____(effect) such as overweight and heart disease—the very the thing the medical community was trying to fight.

    Eat and salt ate very important parts of a diet. They are required____(process) the food that we eat, to recover from injury and for several other bodily functions. When fat and salt____(remove) from food, the food tastes as if it is missing something. As ____result, people will cat more food to try to make up for something missing. Even ____(bad), the amount of fast food that people eat goes up. Fast food ____(be) full of fat and salt; by____(eat) more fast food people will get more salt and fat than they need in their diet.

    Having enough fat and salt in your meals will reduce the urge to snack between meals and will improve the taste of your food. However, be____(care) not to go to extremes. Like anything, it is possible to have too much of both,____ is not good for the health.

已知 $\frac{x}{y}$ ＝ $\frac{1}{3}$ ，则 $\frac{x+y}{y}$ ＝____．