15.It is Sunday.Mary goes shopping with her mother,Mrs.Green.Her mother wants to buy some food.Mary wants to buy a new skirt and some school things.They come to a shop. Mary asks the salesgirl(售貨員), "What do you sell(賣) in your shop?" "A lot of things," the salesgirl says. "You can buy food,drinks,clothes in our shop and school things,too." There are many people in the shop.Mary finds a nice white skirt.She likes it. "How much is the skirt?"Mary asks the salesgirl. "It's eighty yuan,"the salesgirl says. "That's too dear,"Mary says. "What about the green one?It looks nice.And it's only thirty yuan,"says the salesgirl.Then Mary buys the green skirt.After that,she buys some school things,too.Mrs.Green buys some bread,cakes,meat and fish.They get home very late.
(1)What does Mary want to buy?
A.Some books. B.A skirt and some school things. C.Some food. D.A pair of shoes. (2)How much is the white skirt?