成语“作茧自缚”说 明此时家蚕已进入了( )期?
A:卵
B:幼虫
C:蛹
D:成虫
有一列数:a1、a2、a3、…an,从第二个数开始,每一个数都等于1与它前面那个数的倒数的差,若a1=2,则a2007为( )
I have a good friend.She is a beautiful girl.She is lovely.She has two big eyes and she's thin.Her favourite colour is red.She likes wearing(穿着)a red dress.She can sing and dance.We often(经常)play together.
商周时期,手工业技术已达到相当高的水平,其中最具代表性的是 青铜制造业。