A、Fish. B、Farm birds. C、Beef. D、Pork. A

Today we are going to learn something about vegetarians who eat vegetables, in the United States. First, there are several ways Americans define a vegetarian diet.(22)Some vegetarians do not eat any meat products or any food made from animal labor, including milk products, eggs and honey. This kind of diet is called a vegan diet. But most vegetarians include dairy products in their diet and many vegetarians eat eggs.(23)Some people consider themselves partial vegetarians, because they do not eat meat or farm birds, but they do eat fish. There are many reasons people choose to be vegetarian.(24)Some religions observe vegetarianism as part of an effort of not using violence towards animals. Many other people have non-religious moral reasons for not eating meat. They believe that killing farm animals for food is immoral and cruel. Other vegetarians believe it is more healthful to eat a plant-based diet. The American Dietetic Association says that vegetarians often have lower blood pressure as well as lower rates of some kinds of cancer. And some vegetarians reject eating meat for environmental reasons. Some studies show that the industry of raising large farm animals leads to water and air pollution, land damage and climate change.(25)Food writer Michael Pollan has a more moderate suggestion than total vegetarianism. He says Americans should eat like people did several generations ago. He says they should eat small amounts of natural, well-grown foods that are mostly plants.