There____ ____ some flowers near the river next year.
—Is _______ ready for the picnic? —No, _______ is wrong with my bike. I can't go bike riding with you.
红光水泥厂2个季度生产了 456吨水泥.平均每月生产水泥多少吨?
已知点A(0,1,2),B(2,3,4),|AB|=( )