【简答题】How many celebrities did the author mention in the passage? He mentioned ________ celebrities in all as examples to support his idea.
【单选题】存储器是计算机中的记忆设备,它主要用于()。
【简答题】Many celebrities use their fame to ________________________ (提升世界对环保问题的关注)
【多选题】在Excel中,下面可用来设置和修改图表的操作有:( )