⑴This is my bed. A.这些是我的书。
⑵These are my books. B.这些是你的尺子吗?
⑶Is this your pen? C.是的,它是。
⑷Are these your rulers? D.这是我的床。
⑸Yes, it is. E.是的,它们是。
⑹Yes, they are. F.这是你的钢笔吗?