桥长10____，船长3____。

树高15____，蘑菇高7____。

渔民身高1____68____。

⑴What is this? ____           A. Thursday.

⑵What are these?____        B. Yes, it is.

⑶What is she wearing?____   C. They're shorts.

⑷Is this a new cap?____      D. She is wearing a blue skirt.

⑸What day is today?____     E. It's a new T-­shirt.

如图是三种脊椎动物形态结构示意图，请据图回答：

人类祖先与猿分界的重要标志是（　　）