The world is in a self-destruction mode. By this statement I mean that the people of the world are bent on making this planet in

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问题    The world is in a self-destruction mode.
By this statement I mean that the people
of the world are bent on making this planet
inhabitable in three distinct ways. Furthermore,        【M1】______
these three ways are all interrelated and
related directly to industrialization.
   The first of three is through pollution              【M2】______
of the air, the water, and the soil.                    【M3】______
Industrialization has meant toxic fumes
in the atmosphere and poisonous substances
in the water and in the soil. Industry has
also been responsible to noise and visual
pollution: the rear of machinery and the
ugliness of factories and cheap housing
developments... these factors take the joy
outside of natural surroundings for human beings.       【M4】______
   However, the balance of nature has been upset.       【M5】______
To feed the hungry factories, huge forests
have been leveled, mountains have stripped of          【M6】______
their protection... The results are farther-
reaching as we can know.                               【M7】______
   The third and the most acute of the problem is       【M8】______
the psychological effect on people of increased
competition and hard economic times. The reasons
that people give for political unrest might be
reasons of belief or religion, but I believe
that it is the desire of people to improve their
standard of life that ultimately causes wars.          【M9】______
Because of the industrialization, much of the
beauty and the simplicity of life is away.             【M10】______
【M3】

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答案of改成to

解析 根据上下文意义,此处应用to,强调“对空气未造成的污染”。
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