He climbed so fast that he reached ______ floor in two minutes.
人体红细胞内的血红蛋白是含钙的蛋白质．（判断对错）
鲫鱼是“四大家鱼”之一．
下列哪项不是鸟类气囊的作用（ ）
The pupils in our school like reading after lunch, most of ________ seated on the grass unless it rains.
