关于个体衰老与细胞衰老的关系，下列说法正确的是（　　）

如图，在△ABC中，∠C=90°，∠B=32°，以A为圆心，任意长为半径画弧分别交AB，AC于点M和N，再分别以M，N为圆心，大于$\frac{1}{2}$MN的长为半径画弧，两弧交于点P，连接AP并延长交BC于点D，则下列说法：

①AD是∠BAC的平分线；

②CD是△ADC的高；

③点D在AB的垂直平分线上；

④∠ADC=61°．

其中正确的有（　　）

I eat too much sweet food. So I have a ____ (tooth).

A: Hey, Lisa! My friends and I were just sharing memories of junior high school.

B: Wonderful, Frank. ____

A: It's so cool. I think it has been fun. Do you think so?

B: Yeah! I've enjoyed every year of junior high school.

A: ____

B: Of course, I do. One of my memories is that I lost my watch in Grade 7. ____

A: Did you find it at last?

B: ____ Sam helped me find it. I was so thankful.

A: Oh. I remember my P.E. teacher best.

B: ____

A: Mr. King. He gave us clear instructions so that we'd be safe when playing sports.

B: I think he was really perfect.