At first, NASA is private citizen’s space travel. Those who want to travel in the space should .

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问题 At first, NASA is ______ private citizen’s space travel.
Those who want to travel in the space should ______.

选项 A、afford the expenses of the space trip
B、pass the health check and physical training
C、speak English
D、all of the above

答案D

解析细节题。文章最后两段说明了太空旅行者必备的条件。倒数第二段说明的是费用([A])；最后一段第一句说明的是健康([B])，第三、四旬说明要懂英语([C])，因此本题答案是[D]。

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