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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 word "it" (Para. 4, the last sentence) refers to ______.
选项 A、great progress
B、agriculture
C、our soil
D、productivity
答案C
解析 该句含义为，人们通过努力使得土壤的种植产量增加，更多的产量势必会耗费更多的土壤养分，然而土壤养分的更新恢复跟不上土壤养分的消耗速度。句中 taking more nutrients from it 指“从土壤中吸取更多的养分”。
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