题目内容：
回答题Earth is the only 21we know of in the universe that can support human life.22 humanactivities are making the planet less fit to live on．As the western world 23on consuming two-thirds of the world' s resources while half of the world' s population do so 24 to stay alive we are rapidly destroying the25resource we have by which all people can survive and prosper．Everywhere fertile soil is 26 built on or washed into the sea．Renewable resources are exploited so much that they will never be able to recover 27We discharge pollutants 28 the atmosphere without any thought of the consequences．As a 29 the planet' s ability to support people is being 30 at the very time when rising human numbers and consumption are 31increasingly heavy demands on it．The Earth' s32resources are there for us to use．We need food, water, air, energy, medicines, warmth, shelter and minerals to 33us fed, comfortable, healthy and active．If we are sensible in how we use the resources they will34indefinitely．But if we use them wastefully and excessively they will soon run 35 and everyone will suffer．
A．situation
B．place
C．position
D．site
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