阅读下列短文，从每小题所给的A、B、C、D四个选项中选出一个最佳选项。

Look at these things. This is Mr. Green's watch. It's yellow. That is Jim's English book. It's blue and yellow. Jim is my cousin. He reads(读) English every day. Oh, what's that over there? It's a white key. It's Miss Green's. Look at the card. What card is it? It is a school ID card. The number is 21893174. Is the card Mary's? No, it isn't. I think it is Bob's. Bob is my brother. He is looking for his school ID card.