Many students know what they want to be in the future* . We think boys are different from girls. Here is a survey in Green High School. Let's look at the diagram* .
下列各句中,没有语病的一句是( )
运动前要做好____,适当活动一下相应部位的____和____,以免发生扭伤等。
半径为1m的圆中,60°的圆心角所对的弧的长度为( )m.