比一比,再组词。
漆____ 换____ 栩____ 坚____
膝____ 唤____ 翔____ 竖____
解方程:x2﹣5x+2=0.
— Four students in Qingdao stood in line against a man to save a woman teacher at the school gate.
— _________ great courage they had!
从动植物的繁殖方式可以看出生物具有多样性。( )