Thinking from the perspective of "benefiting the big", students on the positive side may put forward some reasons: (1) The invention of these means of transportation, such as automobiles, has made people travel more convenient, saving time and effort. (2) The invention of telephone and mobile phone makes people's communication more convenient. (3) Computers and faxes have liberated people from heavy work, and the emergence of the Internet has broadened people's horizons. ...

The opposing students may put forward some reasons from the aspect of "great harm": (1) The emission of automobile exhaust has caused environmental pollution and seriously affected people's health. (2) The appearance of entertainment facilities such as TV makes the communication between people less and less, and the human feelings are weak. (3) The emergence of the Internet has given some people the opportunity to disrupt people's production and life ...)

Disadvantages: 1: Environmental pollution. This is the most direct and obvious disadvantage.

2. Species extinction is accelerating. This is caused by environmental pollution and human hunting. It also belongs to the disadvantages of scientific and technological development.

3. Personal safety is increasingly insecure. Now tens of thousands of crimes occur on average every day. Most of their criminal methods are related to the current new technology. Especially gun-related crimes, ordinary people can't prevent them. From the Second World War, we can already see that with the development of science and technology, the damage and losses caused by the current war are far from comparable. It may even lead to the fate of human extinction.

Human's physical quality is not as good as before. With the development of science and technology, the emergence of vehicles such as air cars, trains and planes has greatly changed human daily life. Human beings are no longer always dependent on their own legs, so the physical quality of human beings is not comparable to that in the past. In today's society, it is impossible for Xiang Yu to "pull out mountains and rivers". If this situation continues to develop, it may make people's limbs atrophy and make people appear.

5. All kinds of emerging germs appear constantly, and the lethality of many germs has far exceeded the destructive power of previous germs. This is because the rapid development of medical science and technology has accelerated the mutation of virus, so that the development speed of science and technology can not keep up with the mutation speed of virus. Maybe one day mankind will perish because of a great plague.