6．完型填空
My formula for staying young is simple： Concentrate 1 the part of you that s young and growing－your brain． Keep your mind awake and you ll stay young all over． These are exciting times. Take an interest 2 the world around you， and make a point 3 learning at least one new thing every day．
Regardless 4 your age， it s not too late to make your life more interesting． I know a housewife with no previous knowledge who made herself 5 an outstanding industrial designer; I know a retired electrical engineer who has become a highly paid artist．6 the notion that you are ever 7 old to go back to school． I know a man who entered medical college at 70． He got his degree with honors and became an eminent physician． 8 man went to law school at 71 and is now an active lawyer．9 years， staying young is easy for those who live In the future． You can do it if you care enough to try． Keep your mind awake and active; that s the only youth elixir（万灵药） 10 to work．
1）A．in B． on C． to D． at

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