单项选择题

A．In 1938.
B．In 1946.
C．In 1955.
D．During the World War II.
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What is the passage mainly about
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Each year 500,000 space tourists could be flying into space if ticket prices could be lowered to________.
Each year 500,000 space tourists could be flying into space if ticket prices could be lowered to________.
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