The average individual's cost of going into space is estimated at a fraction of the price per economy ticket of transatlantic airplane travel by the end of the 21st century.
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AThe average individual's cost of going into space is estimated at a fraction of the price per economy ticket of transatlantic airplane travel by the end of the 21st century.
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BThe average individual's cost by the end of the 21st century of going into space is estimated at a fraction of the price per economy ticket of transatlantic airplane travel.
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CBy the end of the 21st century, the average individual's cost of going into space is estimated at a fraction of the price per economy ticket of transatlantic airplane travel.
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DTo go into space, the cost to the average individual is estimated at a fraction of the price per economy ticket of transatlantic airplane travel by the end of the 21st century.
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EIt is estimated that by the end of the 21st century the cost to the average individual of going into space will be a fraction of the current price per economy ticket of transatlantic airplane travel.
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正确答案: E