Check carrots,potatoes, onions and any other vegetables_____ and immediately use or throw away any which show signs of rotting.
A:in demand
B:in store
C:on loan
D:on sale
扇形AOB的周长为8cm.,它的面积为3cm2,求圆心角的大小.
异性交往有利于促进身心健康。但与异性交往最容易引起误解的是( )