Section B,Unit 3,Keep Fit,skateboard,/sketbd/,cn.滑板,skateboard,cn.滑板,+,-ing,后綴,skateboarding,n.滑板運動,我的滑板很酷.我非常喜歡滑板運動.,My _ is cool and I like _ very much.,skateboard,skateboarding,encourage,/nkrd/,v