高二 U2

 https://docs.google.com/presentation/d/1eol4i79VsejtDrGLsGXSIwpHvb6Cp6b6/edit?usp=drivesdk&ouid=118389955841692397006&rtpof=true&sd=truehttps://docs.google.com/presentation/d/1eol4i79VsejtDrGLsGXSIwpHvb6Cp6b6/edit?usp=drivesdk&ouid=118389955841692397006&rtpof=true&sd=true