题目内容
如下图，用边长为1厘米的正方形摆图形.第一层摆1个、第2层摆2个，……，第1000层摆1000个，这图形的周长是多少厘米？
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Earth is the only 21 we know of in the universe that can support human life.22 human activities are making the planet less fit to live on. As the western world 23 on 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 the 25 resource 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 27 We 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 31 increasingly heavy demands on it. The Earth" s 32 resources are there for us to use. We need food， water， air， energy， medicines， warmth， shelter and minerals to 33 us fed， comfortable， healthy and active. If we are sensible in how we use the resources they will 34 indefinitely. But if we use them wastefully and excessively they will soon run 35 and everyone will suffer.
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