In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. The best way to finance new

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问题 In 1961, NASA has encouraged studies of space-planes that could be built using existing technology.
The best way to finance new space-planes and space stations is______.

选项

答案to carry tourists

解析 筹措建太空飞机和空间站的资金的最好方式就是运载游览观光者。
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