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11.What can be the best title for the text?A.We need a rapid urbanization worldwideB.Urbanization?Greater efforts are neededC.Overpopulated?We're ageing and shrinkingD.The total population in the world is decliningWhen SpaceX's 20th resupply mission lifted off to the International Space Station inMarch 2020,beating heart cells were along for the ride.After 22 days,the heart cells weDetured to Earthand they were still beating.This experiment marked a significant steptoThe beating heart ce,calledcrdiomy(心肌细胞)，featured in the experimentward helping heart patients on Earth in the future.巅eregon from a kind of stem cTheylimost all kinds of cells in our body,including beating heart cells.The heart cells have thepotential to treat heart diseases for kids and adults.But to repair a damaged heart,we will学need a lot more cardiomyocytes,"Chunhui Xu,researcher and associate professor of pediatricsStem cell therapies to repair damaged heart cells requireat least 1 billion ells per patient,at Emory University School of Medicine.$When her experiment using simulated micro gravity on Earth showed promising steps towarquickly and safely producing cardiomyocytes,Xu saw space as the proving ground.Her exper-iment was chosen to fly on the space station in order to determine how the absence of gravityThe heat celrrandhee they reached the Thisimpacts stem cells that are essentially turned into heart cells.lwed theetogwinforNASAMer overtheperiment while it was on the spacesioce where every person and everything is living inatotallydifferenrerenEarth.Wea test things thatwe can't do anywhere on Earth,"Meir said.When these live cells returned to Earth,Xu and her colleagues discovered that the stemcells grow faster in zero gravity.This means that more cells can be grown at a faster rate.This rapid ability to grow cardiomyocytes could generate a large number of healthy heart cellsfor children and adults with various heart diseases.It opens up the possibility for personalizedmedicine and could allow for the testing of medication or treatments on cells,rather than the12.Why does the author add the words "and they were still beating"in paragraph 1?patient.A.To solve readers'puzzles.B.To report the advantage of SpaceX.C.To describe the future of SpaceX.D.To stress the success of the experiment.13.Why did Chunhui Xu send her experiment to space?A.To try heart transplant in space.B.To test a way to speed up stem cell growth.C.To study the effects of zero-gravity on brain cells.D.To understand how human hearts change in space.14.What would Jessica Meir probably think of doing an experiment in space?C.Complex.D.Expensive.全国100所名校最新高考模拟示范卷第4页（共8页）【22·（新高考）ZX·MNJ·英语（三）·SD)A.Unique.B.Dangerous.