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Life in the countryside is quite different from that in the city. First, it is the atmosphere that differentiates the two living environments. In the countryside, the air and water are much fresher and safer, thus living there is totally comfortable and beneficial for our health. In contrast, people who live in big cities suffer from health problems and diseases related to poor air quality and sources of polluted water. Second, prices and costs of living are cheaper in the countryside than in big cities. Vegetables, fruits and meats are home-grown and home-produced. However, in cities, people have to go shopping for them. Third, the interpersional relationships are more harmonious and friendlier. Those who live in the same village, especially neighbours, for example, know each other very well. There is a close-knit cooperation between people in working and many other daily activities. On the contrary, negatively speaking, city people only live and know their own business. They hardly care about who their neighbours are and what they do. Sending a helping hand, as a result, is never seen among city people. In conclusion, although the city life holds many advantages that make life more convenient, I always prefer living in the countryside where the environment is nice, the costs of living is affordable, and the intimate relationships among people are really meaningful. Personally, If I had a choice between a villa in the city and a small house with garden surrounding, the latter would seem better to me.

Countryside is the most comfortable place to live for three main reasons. First, living in the countryside, we can see the natural landscape. Mountains, trees, beautiful flowers and birds are what we can see every day in the countryside. Moreover, we can see sunrise and sunset in the early morning and evening. During the sunset, we can sit on the grasses near the pond, and see the reflection between the sun and the water. Second, less-pollution is also the main factor that attracts our feeling to live in the countryside. Because there are no large-scale factories, most people in the countryside do not need to care very much about health concern that comes from chemical substances, the crucial cause of pollution. Furthermore, we can absorb the fresh air into our body; not the polluted substances. Third, by living in the countryside, we are very easy to make communications with people. People have to be accompanied by communication, and they would find the easiest way to make it because countryside is built by small communities. Villagers in the countryside spend only a short time to get to know their neighbors, so they will never be alone when they encounter any incident. Additionally, the solid communication of people in the countryside is stronger than what we have seen in other places. In short, living in the countryside is even more comfortable than other places that we used to live. We should help to develop the countryside and keep supporting the concept of living there.

Biết thanh thủy tinh tích điện dương sau khi cọ xát vào lụa. Lấy mảnh vải khô cọ xát vào thước nhựa thì thước nhựa tích điện âm. Đưa mảnh lụa và mảnh vải lại gần nhau thì chúng đẩy hay hút nhau, vì sao?

A. Đẩy nhau vì mảnh lụa tích điện âm, mảnh vải tích điện dương

B. Hút nhau vì mảnh lụa tích điện âm, mảnh vải tích điện dương

C. Đẩy nhau vì chúng đều tích điện âm

D. Hút nhau vì chúng tích điện trái dấu

Cọ xát mảnh pôliêtilen bằng miếng len rồi đưa miếng len này lại gần mảnh pôliêtilen thì chúng hút nhau

Phát biểu nào dưới đây sai?

A. Điện tích trong hai mảnh nói trên là khác loại

B. Mảnh pôliêtilen nhiễm điện âm, mảnh len nhiễm điện dương

C. Một số electron đã từ mảnh len dịch chuyển sang mảnh pôliêtilen

D. Mảnh pôliêtilen nhiễm điện, còn mảnh len không nhiễm điện