题目

English is one of the most widely spoken languages in the world. Leaning English well is very important. Here are some methods that can help you learn English well.Do a lot of listening. Listen to recordings of your teacher, the radio, TV video cassettes, audio cassettes anything that you can get your hands on. Just listen to English as much as you can and you will learn a lot.Every time you learn something new, write it down in a notebook. This will help you remember what you have learned. Buy a notebook and use it only for practicing English.Try to read English one hour every day. Yes, this 20．一个不透明的袋子里装有3个白球、1个红球，这些球除了颜色外无其他的差异，从袋子中随机摸出1个球，恰好是白球的概率是$\frac{3}{4}$．