when falling at speeds up to 60 miles per hour, cats stretch their legs which increases their air resistance and reduces the shock of impact on hitting the ground.还有at speeds up to 中的up to 是:直到(达到)的意思吧
And what better way to answer skeptics from any group than by certifying the technical skills of graduates from a national service program?怎么感觉这句话不完整,整句话就只是个名词没有谓语和宾语的样子啊?