被称为“三叶虫时代”的是(    ) A.寒武纪        B.第三纪 

被称为“三叶虫时代”的是(    )

A.寒武纪        B.第三纪         C.第四纪       D.白垩纪

答案

A

相关题目

—How long _______it _______ you to work out such a difficult problem? —About
—How long _______it _______ you to work out such a difficult problem? —About thirty minutes. A. did… take                            B. does… take         
当x=_______时,式子4x+8与3x-10相等.
当x=_______时,式子4x+8与3x-10相等.
____I sympathize with those who have gone bankrupt, I can’t really do very muc
____I sympathize with those who have gone bankrupt, I can’t really do very much to help them out of the difficulties, especially when the U.S.economy has moved into a recession. A.As long a
在△ABC中,如果∠A、∠B满足|tanA﹣1|+(cosB﹣)2=0,那么∠C=
在△ABC中,如果∠A、∠B满足|tanA﹣1|+(cosB﹣)2=0,那么∠C=
鉴别一个细胞是动物细胞还是植物细胞,最可靠的方法应检
鉴别一个细胞是动物细胞还是植物细胞,最可靠的方法应检查它  (     )      A.有无叶绿体      B有无液泡    C.有无中心体    D.有
He was driving home one evening when he saw an old lady standing by the road. He
He was driving home one evening when he saw an old lady standing by the road. He could tell she needed help. So he stopped his car in front of her car and got out.He smiled at her, but she was worried
某商场举行抽奖活动,从装有编号0,1,2,3四个小球的抽奖
某商场举行抽奖活动,从装有编号0,1,2,3四个小球的抽奖箱中,每次取出后放回,连续取两次,取出的两个小球号码相加之和等于5中一等奖,等于4

最新题目