And once you start replacing real human contact with cyber-interaction, coming back out of the cave can be quite difficult. What does " cave " here refer to?
A.
the isolated life of the virtual world.
B.
a large hole in the side of a hill or under the ground
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【单选题】_____, she was able to communicate with French people.
【简答题】下图所示是用于气体制备、干燥、性质验证、尾气处理的部分仪器装置(加热及夹持固定装置均已略去)。请根据下列要求回答问题。 (1)若烧瓶中盛装锌片,分液漏斗中盛装稀硫酸,则: ① 当仪器连接顺序为A→C→B→B→D时,两次使用B装置,其中所盛的药品依次是CuO、无水CuSO 4 粉末。此实验的目的是____________。D装置的作用是__________________。 ② 为了使B中CuO反应...