2007年12月英语六级短文改错25

真题演练：

Until the very latest moment of his existence, man has

been bound to the planet on which he originated and

developed. Now he had the capability to leave that planet ___1___

and move out into the universe to those worlds which he has

known previously only directly. Men have explored parts of ___2___

the moon, put spaceships in orbit around another planet and

possibly within the decade will land into another planet and ___3___

explore it. Can we be too bold as to suggest that we may be ___4___

able to colonize other planet within the not—too—distant ___5___

future? Some have advocated such a procedure as a solution

to the population problem. ship the excess people off to the

moon. But we must keep in head the billions of dollars we ___6___

might spend in carrying out the project. To maintain the earth’s

population at its present level. we would have to blast off into

space 7,500 people every hour of every day of the year.