suggest that we may be able to colonize other planet S5._______
within the not - too - distant 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 might S6._______
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 S7._______
exploration ? Consider the GREat need for improving S8._______
many aspects of the global environment, one is surely
justified in his concern for the money and resources
that they are poured into the space exploration efforts. S9._______
But perhaps we should look at both sides of the
coin before arriving hasty conclusions. S10._______
[ 结 束 ]
