3. Importance of Education（教育的重要性）
China, as a developing country, is determined to catch up with and even surpass the developed ones. I think that one of the best possible ways to do so is to give first priority(优先）to the development of culture, science and especially education.
In modern times, when science and technology are making great progress, the education of the work force is of primary importance. Moreover, many of the success in advanced countries have demonstrated that a nation 's prosperity mainly depends on the quality of its labour force, namely those who have been well educated.
In a developing country such as China, our investment in culture, education and science, and especially elementary education, must enjoy top priority. This is crucial(决定性的）for China to catch up with the developed nations in today's surging(汹涌的) waves of technological revolution. Otherwise, the gap between China and advanced countries will be widened rather than bridged.
4. Air Pollution（环境污染）
Air pollution is one of the major problems of the modern world. A great deal of energy is needed to run the factories of modern industrial nations. Automobile, trains, planes and busses need energy, too. Nearly all of this energy is produced by burning fuels. The burning produces wastes, some of which remain in the air, causing air pollution.
Scientists are finding ways to stop air pollution especially in big industrial areas and densely-populated cities. They are studying new ways of generating electricity that may be less damaging to the environment. In the meantime, many power plants are being modernized to give off less polluted material. Also, engineers try to design and locate new power plants to do minimum damage to the environment.
However, it may be that we still have a long way to go before we have a "clean" world. Nearly all of the countries are trying hard to prevent and control air pollution. There indeed seems to be no end to tasks that environmentalists will be required to do. People will continually find new ways to control pollution.