Junk food is food that has a lot of calories but few nutrients (营养物质), vitamins and minerals (矿物质). Some food does have nutrients, for example pizza, but because it contains too many calories, it is 48______ called junk food. Fruit and vegetables are the best examples of good food. 49______ contain few calories and many vitamins and minerals. A healthy diet should include a variety of food, most of 50______ should be rich in nutrients. That does not mean that we are never allowed to eat junk food. 51______ of us who love French fries, sweets, ice cream and cheeseburgers can still enjoy an unhealthy bite every now and then. All we have to do 52______ to be careful how often and how much we eat 53______ it.

If we make the right choices about 54______ we eat, we will be healthier 55______ have more energy to enjoy the good things in life. A balanced diet combined with exercise is the key to a healthy life.

随着微信的普及，广人商家开始关注并大力开展“微信营销”活动，通过与消费者开展微信互动，引导消费者的消费习惯，提升人气，提高了品牌知名度。“微信营销”的经济学依据是（）

①消费是生产的目的

②消费决定生产的质量和水平

③“微信营销”是树立良好的企业形象的重要途径

④生产与消费相互影响

A、①②

B、①④

C、②③

D、③④