When I got to school, I realized I ______ my backpack at home.

下图是克隆羊多莉形成过程的示意图。请据图回答：

⑴多莉是由受精卵发育成的吗？____ 。
⑵与它身世有关的母羊有____ 只，它们分别是____ 、____ 和____ 。
⑶由示意图可知，多莉是由A羊提供的____ 和B羊提供的____ 融合而成的细胞发育来的。
⑷从结果来看，多莉的样子与B母羊一模一样，这说明它的____ 来自B母羊，而B母羊提供的是____ ，这说明遗传物质在____ 中。

阅读短文, 选出正确答案。

（A）

   A picture is on my desk. It is a picture of Mary's family. The man is her father Mr. White. He is a doctor. A woman is behind Mary. She is her mother. She's a teacher. A boy is in the picture, too. He is Mary's brother, Sam. Mary and Sam are in the same school. But they aren't in the same grade. They look like their mother. The White family are English. They come from London.