2017年北京高考英语完形填空_2017年高考英语完形填空巩固练习：第5套

How do you get rid of the body of a dead astronaut on a 30-month mission to Mars and back? When should the plug be pulled on a seriously ill　1　who is using up precious　2　and endangering the rest of the crew? Should NASA employ DNA testing to　3　astronauts who might get a disease on a (n) 　4　flight?
　　NASA has begun to　5　some of the　6　and ethical (伦理的) questions posed by deep space　7　.
　　For now, astronauts who become seriously sick or injured at the international space station—something that has never happened can leave the　8　station 220 kilometers　9　Earth and return home within　10　aboard a Russian Soyuz space vehicle.
　　That wouldn’t be possible if a (n) 　11　situation were to arise on a voyage to　12　where the　13　hospital is millions of kilometers away.
　　In　14　space travel, the most serious problem is the　15　challenges of isolation—　16　knows what it will feel like to watch one’s home planet dwindle (缩小) into invisibility.
　　Russian scientists have been conducting a series of long-term human　17　experiments for years. In January 1999, during an experiment, a woman was forcibly kissed by the team commander, twice. 　18　, two men fought for ten minutes and left　19　spattered on the walls. From 1999 to 2000, a series of international teams performed simulated (模拟的) outer-space explorations—and mainly they discovered the dragons that lurk (埋伏) in inner space—inside their own　20　.

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