Space travel has never been billed (31) a first-class affair, but back in 1939 it was deemed downright uncivilized in the Febr

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问题   Space travel has never been billed (31) a first-class affair, but back in 1939 it was deemed downright uncivilized in the February 20, 1939, issue of TIME. The article summarized the British Interplanetary Society’s prediction of (32) astronauts would forgo on their (33) to the moon. Topping the list: smoking and water for washing-and there would be just enough coffee to keep the navigators from "(34) asleep over their interminable calculations".
  By 1951 space (35) plans had become more grandiose. Famed rocket scientist Werner von Braun predicted (36) a successful Mars (37) could be accomplished with (38) few as 46 rockets in a round trip that would take three years, in a later (39) with TIME, yon Braun affirmed. "Man belongs (40) he wants to go-and he’ll do plenty well when he gets there".
  With the (41) War heating up, the space (42) became an historic rivalry between United States and the Soviets. TIME heralded the (43) seven Mercury astronauts as men of destiny. Soviet astronaut Yuri Gagarin (44) TIME’s cover (45) he became the first human in space on April 12, 1961, but the article (46) described the event in heroic terms also lamented the U.S.S.R. triumph as an American propaganda defeat. (47) than a year later when John Glenn’s flight put America back in the space race, TIME lauded Friendship 7’s success as a triumph for the entire free world.
  In 1969 TIME covered the culmination of the Apollo program (48) a special package, "To the Moon", calling the (49) flight "the most momentous journey since 1492". The next week’s issue featured a cover story celebrating Neil Armstrong’s "giant leap for mankind", asserting that the success of the mission was "a shining reaffirmation of the optimistic premise that (50) man imagines he can bring to pass".


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答案flight

解析 上句提到宇航员,有前往月球,那应该是飞行。
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