2. 外语
  3. A flight to other solar systems will be made more possible by ______. According to this text, piloted space missions will need

A flight to other solar systems will be made more possible by ______. According to this text, piloted space missions will need

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问题 A flight to other solar systems will be made more possible by ______.
According to this text, piloted space missions will need to be ______.
选项 A、more exciting than earlier film versions.
B、supported by international organizations.
C、more cost-effective than they appear to be at present.
D、financed by individual governments.
答案C
解析 第三段说探索太空的专家们正面临着如何降低太空飞行的成本问题，因此载人太空任务只能在成本大大降低时才能成为可能。只有C项最为贴切。
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