题目

阅读理解Want to know what we can doto help make our city a better place to live in? Why not take part inClean & Green weekend? Join us, and you can make new friendsand help protect the environment at the same time. Park LifeDo you like playing andrelaxing in the park with your friends? If so, why not take the chance to comewith us and tidy up the park when you go? To add some fun, there is a gift forthe person who collects the most rubbish! Meet us at the south entrance toTaohe Park at 9 a. m. next Saturday if you want to join in. The Air You BreatheA great way to make the airwe breath甲、乙两物体质量之比为m甲:m乙=5:1,甲从H高处自由下落,乙从2H高处同时自由下落,不计空气阻力,以下说法正确的是(  )A.在下落过程中,同一时刻甲的速度比乙的速度大B.在下落过程中,同一时刻二者速度相等C.甲、乙在空气中运动的时间之比为1:2D.甲落地时,乙距地面的高度为H
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