问题详情

根据短文，回答{TSE}题 The future of space exploration depends on many things．It depends on how technology evolves how Dolitical forces shape competition and partnerships between nations，and how important the public feels spaceexdloration is．The near future will see the continuation of human space flight in Earth’s orbit and unpiloted space mght within the so1ar systern．Piloted space flight to other planets，or even back to the moon, still seems far away．Any flight to other solarsystems is even more distant'but a huge adVance m space technology could drive space exploration into realms currently explored only by science fiction．The 1968 film 2001：A SpacP Odyssey depicted commercial shuttles flying to and from a giant wheel- shoped space station in orbh around Earth，bases on the moon，and a piloted mission to Jupiter. The real space activities of 2001 will not match this cinematic vision，but the 21st century will see a continuation of efforts to transform humanity into a spacefaring species．Perhaps the most difficult problem space planners face is how to finance a vigorous program of piloted space exploration.in Earth’s orbit and beyond．In l998 no single government or international enterprise had plans to send people back to the moon，much less to Mars．Suchmissions are unlikely to happen until the perceived value exceeds their cosLOne belief shared by a number of space exploration experts is that future lunar and Martian expeditions sheluld be aimed at creating permanent settlements．The residents of such outposts would have to“live off the land”．0btaining such necessities as oxygen and water fromthe harsh environment．On the moon，pioneers could obtain oxygen by heating lunar soil．In l998 the Lunar Prospector discovered evidence ofsignificant deposits of ice，a valuable resource for settlers，mixed with soll at the lunar poles．On Mars，oxygen could be extracteel from the atmosphere and water could come from buried deposits of ice．The future of piloted lunar and planetary exploration remains largely unknown．Most space exploration scientists believe that people will be on the moon and Mars by the middle of the 21st century，but how they get there，and the nature of their visits，is a subject of continuing debate．Clearly，key advances will need to be made in lowering the cost of getting people off Earth，the first step in any human voyage to other worlds．{TS}A flight to other solar systems will be made nlore possible by__________．[A]technological breakthroughs[B] international cooperation[C]market competition[D]public pressure请帮忙给出正确答案和分析，谢谢！