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  3. What we don’t know or refuse to recognize is that modern man has been altering his total environment so swiftly and suddenly tha

What we don’t know or refuse to recognize is that modern man has been altering his total environment so swiftly and suddenly tha

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问题     What we don’t know or refuse to recognize is that modern man has been altering his total environment so swiftly and suddenly that the whole "great chain of life" on this planet is in danger.
    All of us live on a tiny spaceship carrying with it its own limited resources for survival.What we have now is all we will ever have to keep us alive.
    But man has been harming this system. He cannot help it. Everything we do alters our environment: the ways we grow food and build shelter and create what we call "culture" and "civilization".
    World population is growing at such a rate that by the year 2050 nearly seven billion people will live on the earth.Industrialization has added its own burden to the population pressure. The more we produce and consume, the more waste products we discharge into the air and water and land around us, where they do not disappear, but last forever in one form or another. Great progress is being made in the productivity of our soil, yet agriculture is now taking more nutrients (营养) from it than are being replaced each year.
    "Ecology", the study of the relationship between life systems and their environment, is what everybody on this planet must now start thinking about quickly if we are to avoid destructive changes within the closed system of our spaceship.
The writer advises us to think about ecology, because ______.
选项 A、it enables us to survive in the closed system of a spaceship
B、it is a modern science that everybody has to learn
C、it can be learned quickly if we study it hard
D、it helps us to understand the relationship between living beings and the environment
答案D
解析 作者在文章最后一段提到生态学，并建议人们考虑生态学方面的问题，也就是考虑人与其所生存的环境之间的关系问题，目的是为了防止人们对自己所生存的这个封闭的系统——地球进行破坏性的改变。spaceship 只是一种比喻，强调地球上的可供人们生存的资源是有限的。
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