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 48still called junk food. Fruit and vegetables are the best examples of good food. 49They contain few calories and many vitamins and minerals. A healthy diet should include a variety of food, most of 50which should be rich in nutrients. That does not mean that we are never allowed to eat junk food. 51Those 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 52is to be careful how often and how much we eat 53of it.
If we make the right choices about 54what we eat, we will be healthier 55and have more energy to enjoy the good things in life. A balanced diet bined with exercise is the key to a healthy life.
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解析：
【小题1】still通过上文表述可知，垃圾食品指没有什么营养物质，但本句表示有营养物质，但是热量太多时，依然被称为垃圾食品，所以填 still
【小题2】They上文举了两种食品为例子，所以用they
【小题3】which本句为非限制性定语从句，代指上文提到的food，介词之后用which
【小题4】Those本句为those作主语，表我们中那些喜欢法国煎饼...的人，用those
【小题5】is本句为all作主语，表事情，谓语动词单数
【小题6】of意指我们吃了其中多少，用of
【小题7】what本句考查宾语从句，宾语从句中缺宾语，表示物，用what
【小题8】and本句考查并列句，无转折关系，有顺延关系，所以用and