用边长相等的正三角形与正方形能够密铺，设在一个顶点周围有x个正三角形的角，有y个正方形的角，则x=____，y=____ ．

阅读下面短文，在空白处填上一个适当的单词。（首字母已给出）

    This is a supermarket. It is new and big. You can buy m____ things here. You can buy food and d____ You can buy fruit and v____ You can buy school things like pens, pencils, pencil sharpeners and so on. You can a____ buy clothes here. You can buy fridges and washing machines, t____ .

  The supermarket is o____ 12 hours a day. There are often many p____ there. The shop a____ work very h____ and they are f____  too. They like to help everybody. I like the supermarket.

下列关于合理营养的叙述，正确的是（    ）