____
我会填上适当的量词。
一____席梦思床 一____火车票 一____金发姑娘 一____矿泉水
裸子植物和被子植物都属于种子植物,两者之间的主要区别是( )
若|m﹣2|+|n+3|=0,求m+n的值.
A note was on the blackboard ______ “All those who have a fever must leave school right now”.