This question is so hard that very ______ students can answer it.
A:few
B:little
C:a few
D:a little
She regretted saying the bad words to her mother. Now she feels ashamed.
工业上常把煤块粉碎并用鼓风机吹起,形成沸腾状燃烧,其目的是( )
下列词语中划线字读音有误的一组是( )
数列{an}中,对任意n∈N*,a1+a2+…+an=2n﹣1,则a12+a22+…+an2等于( )