A:c(CH3COOH):①>②
B:c(CH3COO﹣):①>②
C:c(CH3COOH)+c(CH3COO﹣):①=②
D:c(CH3COO﹣)+c(OH﹣):①<②
Don't make him all the time. Tell him a rest.
____ He's my brother.
____ Who's that boy?
____ Yes, she is.
____ Is she your mother?
____ No, he isn't. He's my teacher.
____ Is he your father?
青藏高原终年雪山连绵,原因是( )