选答语。
①What's your name? ____ A. I'm from China.
②Where are you from? ____ B. He's my grandpa.
③Who's that man?____ C. My name is Tutu.
无论各种鸟的生殖和发育有何特点，在生殖和发育过程中，鸟必须具有哪几种行为（ ）
