根据首字母或汉语提示，补全单词。

1. I _______ (参加) you for breakfast this morning.

2. My mother is making soup. It smells _______ (香).

3. They enjoyed _______ (种) vegetables.

4. He won. We are p_______ of him.

5. I built one of my rockets m_______ at home.

发射类型中，第一个符号表示（）

A、主载波调制的种类

B、调制载波的信号性质

C、所发射的信息种类

D、副载波调制的种类