一密闭烧瓶中装有NO2气体,在一定条件下达到化学平衡,现将该烧瓶放在热水中,( )A 颜色不变 B 颜色变浅 C 颜色变深 D 无法判断
Charles was alone at home, with_______ looking after him.
It is often ______ that human beings are naturally equipped to speak.
I can’t leave. She told me that I ______ stay here until she comes back.
—— Do you mind my opening the window? It’s a bit hot in here. —— ______ , as a matter of fact
It’s high time you had your hair cut ; it’s getting _______ .