填空题

Until the very latest moment of his existence, man has been bound to the planet on which he (36) ________and developed. Now he has the (37) ________to leave that planet and move out into the universe to those worlds which he has known (38) __________only indirectly. Men have explored parts of the moon, put spaceships in orbit around another planet and possibly within the (39)________will land onto another planet and explore it. Can we be so (40) _________as to suggest that we may be able to (41) _________other planets within the not-too-distant future Some have (42) _________such a procedure as a solution to the population problem: ship the (43) __________people off to the moon. (44)_ ____________________________. 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. (45) _____________________________ Considering the great need for improving many aspects of the global environment, one is surely justified in his concern for the money and resources that are poured into the space exploration efforts. (46)_____________________________.