A:外形相同
B:功能相同
C:解剖结构相同或相似
D:适应的环境相同
选择合适的句子补全对话。
Amy: Where is my ruler, John?
John:____
Amy: No, it's not in my pencil box.
Amy: Yes, thanks.
A. Look, it's on your desk. B. Is it in your pencil box?