学习课文《女蜗造人》后想一想:女娲为什么要造人?
因为世上没有像女娲那样的生物,女娲感到孤单寂寞。
(x+1)4的展开式中x2的系数为
一 What do you think of the new movie?
— To tell you the truth, I think it's boring.