Sending people to other planets or even beyond the solar system is not an easy goal(1)to achieveto achieve(achieve).One of the problems is that the trip would take a very long time.For example,using current technology,it would take over two years(2)to getto get(get)to the closest planet,Mars,and back.Although light is the fastest thing known in the universe,it could take more than four years to reach the nearest star system.Will scientists figure out a way(3)to storeto store(store)sufficient food and water for the long journey?Is it possible to travel faster than light?No one knows the answers yet.However,space scientists never give up.They are experimenting with growing crops in space so as(4)to helpto help(help) astronauts get enough food on longer journeys through space.
【答案】to achieve;to get;to store;to help
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發(fā)布:2024/6/27 10:35:59組卷:2引用:1難度:0.6
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