(____)1. A. school B. plane C. ship
(____)2. A. take B. pick C. train
(____)3. A. skate B. book C. jump
(____)4. A. near B. why C. who
(____)5. A. clothes B. prince C .fairy
已知2xmy3与3xyn是同类项,则代数式m-2n的值是( )
有关一氧化碳和二氧化碳说法正确的是()