— What are you going to do today?
— _____________. ( )
A:What's this?
B:I'm going to go to the park to play.
C:What are you doing?
伽利略的斜面实验证明了( )
用NA表示阿伏加德罗常数的值.下列叙述正确的是( )
请背诵词汇表,并默写单词。副 词:
①p____礼貌地;客气地
②f____忠实地;忠诚地