下列哪一种材料的硬度最小（    ）

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.