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Historical selectivity is mandatory. Reasons for the development of modern science and technology.
The reason for the development of modern science and technology is the military demand of World War II.

The reasons for the development of modern science and technology include the military needs during World War II, the requirements of the arms race during the Cold War and the requirements of economic development after World War II.

The concept of history is people's generalization and summary of historical facts, which contains specific meanings.