题干
Why does the man want to be a volunteer?
A：Because he wants to watch the game.
B：Because he wants to help other people.
C：Because he wants to be a guide.
答案(点此获取答案解析）
B
代表一个碳原子， 
代表一个氢原子， 
代表一个氧原子．下列说法错误的是（ ） 
