For this price, space tourists receive (5) A B C D training in a 'resort setting', followed by the holiday of a lifetime orbiting the Earth. Two astronaut pilots and four astronaut tourists will (6) A B C D the trip. However, sceptics say that these budgets are inadequate. Although they predict that space tourism will eventually bring an income of US$10 – 20 billion a year, they calculate that the budget of $8 million per trip will not be enough to pay (7) A B C D the required technology.
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发表于 2022-7-28 17:08:45
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发表于 2022-7-30 01:50:36
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