2. 外语
  3. In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. In April 1995, makes the___

In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. In April 1995, makes the___

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问题 In 1961, NASA has encouraged studies of space-planes that could be built using existing technology.
In April 1995, makes the______.
选项
答案unpiloted single-stage-to-orbit launcher
解析 文章第6段的最后1句，1995年4月，所签署的具有竞争力和研究性的合同，制造出了一种无人驾驶的单级轨道的运载火箭。
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大学英语六级

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