求英语阅读理解的答案

How long, some readers will ask, has the world endured? That is a question which has attracted much attention in the last few years. Gradually the earlier estimates, which varied very widely, have been brought towards agreement. Astronomers and mathematicians who base their computation on the rate of cooling of celestial bodies and on various processes of diffusion and atomic change, give us 2,000 million years as the age of the earth as a body separate from the sun, and about 300 million years as the length of time since life appeared upon it in any abundance. The age of the sun as a star is now supposed to be somewhere in the nature of five billion years. The earth, says Sir James Jeans in his Universe Around Us, will in all probability go on for another billion years and then its equatorial temperature may be sinking to Arctic conditions. Since man has existed as a self-conscious social creature for only 30,000 years or less, this gives him illimitable opportunity for the attainment

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