A:to inform
B:informing
C:informed
D:be informed
《史记》和《资治通鉴》是我国著名的史学著作,这两部著作的共同点有( )
吃饭时随意谈笑,食物能误入气管,原因是( )
Please play with her and let her not feel .
he sees people in trouble,he always gives them a hand.
实验过程中小红发现反应有快慢,请你列举一种判断反应快慢的方法: ____