任务型阅读 People are often free on weekends. But Mike had a busy weekend last week. On Saturday morning, he went to visit his uncle with his parents. His uncle lives on a farm. There Mike help
Although I love my life, it hasn’t been a lot of fun as I’ve been ill for 28 years. Music has always been a great love of mine and, in my 20s, when my 36 was more manageable , I 37
=1kg 物体运动中的阻力等于物体的重力的下滑分力，则sinθ=f/mg=1/2倾角θ为30°