若矩形的面积为6，则矩形的长y关于宽x（x＞0）的函数关系式为 _________ ．
y=．
大青叶的主治证是（）
A.热入营血温毒发斑
B.外感风热
C.喉痹口疮
D.丹毒痄腮
E.湿热泻痢
–___________ do you visit your grandparents? –Twice a month.
A. How long B. How soon C. How often
．
．