issue69, 还有5天考作文，求各位执教！

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Is it necessary that scientific researches and development be restricted by government? The author believes not. In my view, however, considering the double-edged characteristics of science, proper restrictions from the government are essential to keep science develops healthily in the long run.

Science is a double-edged sword which can bring not only convenience but also disasters to the whole society. Admittedly, it is the scientific development that brings us the assembly line manufacturing which increases our working efficiency significantly. In the education realm, long-range instruction based on internet is realized in order to provide common people with easier access to education. In the agriculture realm, the newly-invented machines have helped a great deal in reducing the labor input. On the other hand, however, it is also the development of science without proper restrictions of applying that leads to many problems. For example, the harmful emissions from the factories destroy the ozone. Deforestation resulting from the increasing demand of industries ruins the habitats of animals and badly influenced the global climate.

Accordingly, the government should place appropriate restrictions to the development of science for the purpose of preventing potential problems that might come along. Absolute freedom of scientific researches might cause social problems which will in turn make the society unstable. It is hard to imagine if the dinosaurs revive, as described in the movie, due to highly advanced technology without enough control from the government. However, excessive restrictions can also cause problem such as depressing the enthusiasm of researchers and ruining the academic atmosphere. For example, the Cultural Revolution, taking place in the 1960's in China, resulted from the unnecessary restrictions to the researches of science and seriously hindered the development of China in many respects. It was not until the leaders replaced the excessive restrictions with wiser regulations that the science was able to boost its development.

The restrictions placed by government on science should be judged according to the different natures and purposes of various research projects. For instance, when we are facing the cloning technology, more factors should be considered because of its complex connections with such sensitive aspects as ethics and morals. If the technology primarily aims at medical cure by transplanting with cloned organs, the scientific researches should be encouraged by the government with little restrictions. However, if the scientists are trying to clone a integrate human body which is against people's common standard of morals and ethics, the researches would be so imprudent that certain measures must be taken by the government to restrict the relative scientific experiments.

In sum, because of the double-edged characteristics of science, restrictions from the government are essential to keep science developing in a beneficial way. And the restrictions should be judged on a case-by-case basis according to the different natures and purposes of scientific researches.