一盒蛋糕是a box of cake还是a box of cakes?为什么

一盒蛋糕是a box of cake还是a box of cakes?为什么 一盒粉笔是a box of chalk 还是 a box of chalks ? There is a lot of ?in the box. A.cake B.bags of cakes C.milk 那cake为什么加sA box of cakes 选is 关于chalk一支粉笔是a piece of chalk那么一盒粉笔是a box of chalk 还是 a box o there are ____(一盒巧克力)on the table.,一盒巧克力是：a box of chocolate a box of a box of apples谓语动词是单数还是复数 two bags of ( ) A.cake B.cakes Here()a box of cakes for you.A is.B are.C has a box of chocolates 是怎么回事? a box of apples对吗?