如图所示物态变化的实例中，属于“吸热”的是（ ）
A：大地回春，冰熔雪化
B：夜幕降临，草叶上形成露珠
C：水沸腾时，壶嘴形成“白气”
D：深秋时节，树枝上形成“霜”
_______ the teacher was very busy, _______he still helped me with my English.
A. boy.
B. It's black.
C. Yes, he is.
D. Her name is Li Hua.
E. She is my English teacher.
大雁的飞行器官是（ ）
