Ice fishing is popular in countries like Russia and Germany. It’s also a popular sport in Canada and the United States. People can go ice fishing all year round in Alaska. The sport was brought to America by European settlers(移民) who came to Minnesota, a state where people are interested in it. Ice fishing was introduced to Canada from Minnesota, and from there to Alaska.

To catch fish, people need lines, hooks(钩子) and other tools through a hole in a lake covered by ice. They can sit in a warm tent on the ice over the hole, or stand in the very cold open air.

Of all the types of fishing, ice fishing may require the least effort and skill, just patience and luck. Followers of this sport won’t be afraid of staying on ice at very low temperatures. There are even ice-fishing competitions and good prizes for winners. At the very least, ice fishing can be a fun way to break up cold and boring winter days, and people can get a taste of the open air.

Plastic stools are common in most homes. Many families have them. Many small restaurants also have these stools. Plastic stools are light and easy to use. Most stools have small holes（洞）on their faces. But why do stools have these holes?

Protect the stool. The holes are very important. It can help them release, pressure（缓解压力）. Without the hole, the stool might break when you sit on it.

Easy stacking. When you aren't using your stools, you might stack them together. One stool goes on top of another. The hole makes it easy to do that.

Easy carrying. Look at the hole. It is not too big or too small. It is just big enough to put your finger inside. You can easily carry a stool by putting your finger in the hole.

We all need to keep healthy. So it's very important to do exercise. But many of you don't know when to exercise. Let's see good or bad things of exercise at different times.