青蛙的个体发育过程是 ( )
A:卵→蝌蚪→成蛙
B:卵→蝌蚪→幼蛙
C:受精卵→蝌蚪→成蛙
D:受精卵→蝌蚪→幼蛙→成蛙
把正确对话的代表字母写在横线上。
①Here you are, Grandma. ____ A. They are in my bag.
②What do you need? ____ B. I need some orange juice.
③Where are my rulers? ____ C. Great!
④Let's have lunch, Sally. ____ D. Thank you, Sally.