关于菜豆种子萌发的叙述，正确的是（　　）

A．只要有适宜的外部环境，种子就能萌发

B．萌发时所需要的营养物质来自于种子内的胚乳

C．萌发的种子，会向外界释放热量

D．萌发时，首先突破种皮的结构是胚芽

根据汉语提示完成句子。

1. You should ____          (仔细考虑) how you organize your birthday party.

2. They wanted to                   (赚钱) for the poor man.

3. When did you                   (收到……来信) Jim?

4. I'm                   (乐于) hear that.

5. I'm thirsty. I want to have some                   (绿茶).