it is known to us all that the computer is the most important invention in the 20th century. it has been developed a lot since it appeared. also, our daily life has greatly changed because of it.

　　a computer can think and remember things like man, but it is millions of times faster than human begins. as a result, computers have been used in the fields of agriculture(农业), industry(工业), education(教育) and so on. for example, we can learn our lessons at home by using a computer instead of going to school.

　　computers have entered our daily life. so it is important for us to learn how to use a computer. and we must start right now.