2. 外语
  3. A flight to other solar systems will be made more possible by ______. It is difficult to send people to other planets because o

A flight to other solar systems will be made more possible by ______. It is difficult to send people to other planets because o

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问题 A flight to other solar systems will be made more possible by ______.
It is difficult to send people to other planets because of ______.
选项 A、lack of capacity of space exploration vehicles.
B、the financial expenditure involved in space travel.
C、controversial nature of space travel.
D、the uncertain future of space exploration.
答案B
解析 由文章第三段“Perhaps the most difficult problem space planners face is how to finance a vigorous program of piloted space exploration...”可知，人类抵达其他星球的最大问题是资金问题，故选B。
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