① Time for breakfast. ____ A. Sing and dance.
② Time for PE class____ B. Drink some milk.
③ Time for English class ____ C. Read and write.
④ Time for music class. ____ D. Jump and run.
有人说:“鸟的全身都为飞行而设计”.下列选项中除哪项外,都是鸟类适于飞行的特点( )