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His story is similar to what many studies show about positive thinking andhealth. Studies have shown a link between a positive mindset and good health.“Optimism means the expectation that good things will happen,or believing thefuture will be favorable because we can control important outcomes,”said HayamiKoga. She is a researcher at the Harvard Center for Population and DevelopmentStudies.Shewas theleadwriter on a2022 study thatfound optimism waslinked tolonger lives and a greater chance of living past the age of 90.Another study showedoptimists generally stayed inbetter physicalhealth as they aged.“Some people are born more optimistic.However, it can be learned,” said SueVarma. She is a professor of psychiatry at NewYork University.She said that evenfor people who do not naturally “see the glass half full",there are skills thatyou canleam.Varma suggests noticing how you deal with uncertainty.Do you worry and waitfor the worst to happen？ If you do,then try lo re-think the situation by looking forsilver linings or determining whether aproblem can be solved.Imagine the bestpossible result and stcps to get there. Finding purpose through volunteering orbringing your interests to work can help,as can learning new skills to keep your mindfrom thinking too much about negative situations.It's a mindsel,”Varma said, adding that it's something she practices daily.30.Why does the writer use the example of David in the first two paragraphs?A.To focus on the imporltance of hard work and effort.B.To warn about sudden health problems among young people.C.To show how a negative mindsct can lead to health problemsD.To explain why people can be successful even with health problems.31.Which of the following would the writer most probably agree with?A.Being optimistic is all up to chance.B.Hoping for good things happens every day.C. Socing Lhe glass half full avoids challenges.D.Changing one's mindset takes practice and effort.英语试卷第9页（共12页）