A big blue whale is 100 feet long and weigh up 150 tons.(对划线部分提问)

问题描述:

A big blue whale is 100 feet long and weigh up 150 tons.(对划线部分提问)
划线部分 100 feet long and weigh up 150 tons
———  ——— is a big blue whale?

(How big)is a big blue whale?
 
一条蓝鲸有多大?
 上面不是有 big了吗?这两个big没有关系。