题干
Though he is ____ at home , he doesn't feel _____ for he has many things to do.
A：alone; lonely
B：lonely ; alone
C：alone ; alone
答案(点此获取答案解析）
A
Though he is ____ at home , he doesn't feel _____ for he has many things to do.
A：alone; lonely
B：lonely ; alone
C：alone ; alone
”表示氧原子，“ 
”表示碳原子，如图能表示二氧化碳分子的是（ ）