上海市大同中学2020-2021学年高二下学期英语期末考试试题

something unusual happens; they become 48 to most age-related diseases--cancer heart disease, diabetes--and live 30-50 percent longer Restricting calories 49 aging. But what are the 50 genes that preserve vitality and starve off diseases? About 15 years ago, armed with powerful new molecular-research technique. a few scientists began to 51 these genetic phenomena. They have discovered that a gene called Sir2--which is present in all animals, including humans--is 52 for the health benefits of calorie restriction. perhaps by repairing our DNA. But if we had to restrict our calorie intake 53 30 to 40 percent would it be of any practical use? Few of us would be capable of restricting our diets so severely that we were constantly 54. Whether or not it made life longer, it would surely make life 55 longer 41. A. suddenly B. eventually C. gradually D. unexpectedly 42. A desire B feeling C. fear D understanding 43. A develop B. design C. control D. solve 44. A reach B. C need D display 45.A. brains B. environment growth D. genes 46. A. but B or C and D 47.Ararely B. occasionally C. normally D. mainlv 48. A resistant B. similar D. accessible 49. A. quickens C avoids D overcomes 50. A available B extra al A. investigate B support C record Dve 52. A. famous generous responsi D. convenient 53. A on B to C D by 54. A disappointed B depressed C starved D. scared 55.A. look B feel C. live D become IV Reading Comprehension Directions: Read the following two passage. Each passage is followed by several questions or unfinished statements. For each of them there are four choices marked A. B c and d. choose the one that fits best according to the information given in the passage you have just read Zelda Fitzgerald, as is revealed by numerous personal books and letters, wore many labels in her life. She was "the original flapper'girl"and"the spirit of the Jazz Age. "Married to the celebrated writer F. Scott Fitzgerald (author of The Great Gatsby ) she was by turns his muse and the wo