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.
Why are we spending so little money on space ___7___
exploration？ Consider the great need for improving many ___8___
aspects of the global environment， one is surely justified in
his concern for the money and resources that they are poured ___9___
into the space exploration efforts. But perhaps we should
look at both sides of the coin before arriving hasty conclusions. ___10___
答案：
1. had -%26gt； has
2. directly -%26gt； indirectly
3. into -%26gt；onto / on
4. too -%26gt； so
5. planet -%26gt； planets
6. head -%26gt； mind
7. little -%26gt； much
8. Consider -%26gt； Considering
9. they -%26gt； /
10. arriving 后加at 或 arriving -%26gt； reaching