题干
I'm glad to ______________ my friend Jenny. She told me something funny in the letter.
A：get from
B：hear from
C：hear of
答案(点此获取答案解析）
B
I'm glad to ______________ my friend Jenny. She told me something funny in the letter.
A：get from
B：hear from
C：hear of
，氮原子的结构示意图为 
，则氮化镓的化学式是（ ）。