A、Foster families of adopted children. B、Only the woman and her twin sister. C、Several twins in adoptive families. D、Adopted chi

M: Imagining growing up and never knowing that you had a sister and one day, finding out you have an identical twin out there. This very thing happened to our guest Elyse Schein.
W: That’s right. I was living in Paris. I grew up knowing I was adopted, (19) but it wasn’t till my early 30s when I sought information about my birth mother. And I got a letter from an adoption agency, saying my birth mother wasn’t looking for me,but I had a twin.
M: And what did you feel like when that kind of news came to you?
W: My life was raising before my eyes! So I came to New York where we were born,and I gave the native adoption agency a call and they said they would help me find her.
M: Is that common policy for the adoption agency to help hook up siblings?
W: It’s funny. It was such an unusual situation, and I don’t think there is any sort of policy about it. But back when we were adopted,it was not a common policy to separate twins. (20) In fact, we were separated into part to participate in a secret study.
M: People were studying in your upbringing?
W: Well,we were studied from the time that we went to a foster home before we were adopted. (21) There were other sets of twins who were studied until they were teenagers and their families knew that they were participating in a child studies. But they didn’t know that their children were actually multiples.
M: It’s your guys’ birthday. Right?
W: It’s our 4 th birthday together.
M: Alright,both of you together blow up the candles. Best of luck to you!
19. What did the woman do in her early 30s?
20. Why were the woman and her twin sister adopted separately?
21. Who participated in the study?