A：植物的导管
B：血小板
C：抗体
D：花粉
A. She's my mother.
B. I have a happy family.
C. What's this?
D. This is my father.
Rose: ____
Tom: It's a picture (照片) of my family.
Rose: Who's this?
Tom: ____
Rose: Who's she?
Tom: ____ And this is me.
Rose: Are you happy?
Tom: Yes. ____
读“我国某种气象灾害平均每年出现次数的分布图”，回答下题。
