2. 外语
  3. Until the very latest moment of his existence man has been bound to the planet on which he originated and developed. Now he had

Until the very latest moment of his existence man has been bound to the planet on which he originated and developed. Now he had

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问题     Until the very latest moment of his existence man has been
bound to the planet on which he originated and developed. Now he had    【S1】 ______
the capability to leave that planet and move out into the universe to
those worlds which he has known previously only directly. Men have       【S2】 ______
explored parts of the moon, put spaceships in orbit around another
planet and possibly within the decade will land into another planet      【S3】______
and explore it. Can we be too bold as to suggest that we may be able     【S4】______
to colonize other planet within                                          【S5】 ______
the not-too-distant future? Some have advocated such a precdure 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 exploration?                【S7】 ______
Consider the great need for improving many aspects of the global           【S8】 ______
environment. One is surely justified in his concern for the money and     【S9】 ______
resources that they are poured into the space exploration efforts. But
perhaps we should look at both sides of the coin before arriving hasty    【S10】 ______
conclusions.
选项
答案had→has
解析 本句有明显的时间副词now。
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