如图，⊙O直径AB和弦CD相交于点E，AE=2，EB=6，∠DEB=30°，求弦CD长．

一个DNA分子复制完毕后，新形成的DNA子链（　　）

D.

    There is a little girl. Her name is May. She is eight years old. May always asks her mother, "Why is my name May?" Her mother says, "Because your birthday is in May." The little girl is very happy and she likes her name. She thinks her name is very interesting. Every year, on May's birthday, all her friends come to her house and say happy birthday to her. They watch TV, play games and eat the birthday cake together. And she can get a lot of presents(礼物).

    May has a little brother. He is five years younger than his sister. She likes him very much. He was born(出生) in April. Can you guess his name? Haha, his name is April. Oh, April will have a sister next month, the second month of a year. Can you guess what her name is?

央视新闻台，献给最美乡村教师!中央电视台和光明日报社共同主办的大型公益活动“寻找最美乡村教师”用真挚的情感，真实记录乡村教师无私奉献、甘为人梯的精神品格。这种品格正是教师职业的诠释。可见，教师（    ）

①是人类文明的传递者

②肩负着教书育人的神圣职责

③对人类文明做的贡献值得我们尊敬

④都是学生的良师益友