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remained on the ground.Afterward,blood samples from the two showed different mitochondrialactivities.For the latest study,Beheshti and his team studied GeneLab data for many types of cellsand tissues.Another focus was related to metabolism(新陈代谢).That process includes a mix ofchemical activities that supports life in cells,organs and the whole body.Damage to mitochondria may be a common factor in spaceflight health risks,the team nowconcludes.Finding similar changes in so many astronauts indeed points to some general effect,agrees Michael Snyder,a systems biologist at Stanford University in California,who worked onScott and Mark Kelly's Twin Study but was not part of the new analysis.If mitochondria are thecause,dealing with problems of them could help protect future astronauts.Some diseases causemitochondrial defects().Dealing with such diseases in different ways may help reduceastronauts'health risks.Future studies could test if existing drugs prevent mitochondrialproblems in cells,animals and people on long deep-space travels.32.What might cause astronauts to have health problems according to the new study?A.Temperature difference.B.Heart cell increase.C.Tiring work.D.Cell problems.33.Which method did Beheshti's team employ to do the research?A.They referred to some existing information.B.They did all kinds of tests on astronaut Scott Kelly.C.They followed some astronauts for many years.D.They observed behaviors of astronauts in person.34.What may contribute to the decrease of astronauts'health risks?A.Taking medicine to treat certain diseases.B.Performing fewer long deep-space travels.C.Letting new structure in cells grow quickly.D.Making astronauts eat as healthily as possible35.What's the main idea of the text?A.Astronauts face great danger in the space stationB.Space travels are really dangerous to astronauts'health.C.Scientists have found ways to reduce astronauts'health risks.D.Space travels may harm health by damaging mitochondria.第二节（共5小题；每小题2.5分，满分12.5分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项，选项中有两项为多余选项。Empty nest syndrome(空巢综合征)refers to.the feelings of loneliness and grief thatparents experience when children leave home for college,work or just to live on their own.Itcan be a difficult experience for a parent.36Prepare for the transitionMany parents are shocked that 17 or 18 years can pass by so quickly,and often feel lost高三英语试卷第7页共11页