B.It cannot be realized without technological innovation.
C.It will not help the realization of racial and economic equality.
D.It cannot be achieved without a good knowledge of the other worlds.
65、 What is the authors attitude toward space programs?
A.Critical.
B.Reserved.
C.Unbiased.
D.Supportive.
66、 What does the author think of the problems facing human beings?
A.They pose a serious challenge to future human existence.
B.They can be solved sooner or later with human ingenuity.
C.Their solutions need joint efforts of the public and private sectors.
D.They can only be solved by people with optimism and ambition.
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