1. (2020·四川模拟) 阅读理解
    We've all experienced it. We invite a friend to dinner, only to learn that she is the dreaded "V-word". Vegan is someone who allows a diet that contains no animal meat, fish, eggs, dairy products, or any other food that comes from animals. They differ from vegetarians, who generally still eat dairy and eggs as part of their diets. Vegans also typically abstain from using any other products that come from animals, such as honey and leather jackets.
    Back in 2008, vegans only accounted for around 0.5 percent of the U. S. population, or about one million people. As of polls taken in 2014, vegans now make up roughly 2.5 percent of the population. At least in the United States, women seem to be far bigger fans of veganism, making up around 79 percent of vegans.
    People on a vegan diet tend to be leaner. In a cross-sectional study of nearly 40,000 adults, meat eaters had the highest mean body mass index, or BMI. Vegetarians were in the middle, and vegans had the lowest. Based on several studies from Finland, some scientists have suggested that vegan diets may be helpful in the treatment of rheumatoid arthritis(类风湿性关节炎). Vegans also appear to have lower rates of hypertension(高血压) than both meat eaters and vegetarians. Vegans also typically have lower cardio metabolic(心脏代谢) risks for conditions like heart disease or strokes.
    While there certainly may be some health advantages in going vegan, there seems to be some common deficiencies in the diet. One of these deficiencies is with the vitamin B-12. The ADA states that there are no natural plant foods that contain any significant amount of the vitamin. Vegans can still get it, but they need to take a vitamin or consume fortified foods like soy milk and certain breakfast cereals. Omega-3 fatty acids(欧米珈-3 脂肪酸) are also very difficult to come by on a vegan diet, but this can be overcome through the consumption of algae(海藻) supplements. With vegans requiring supplementation to meet their nutritional needs, it supports the claim that veganism is unnatural, but that doesn't necessarily mean it's unhealthy.
    Many health organizations, including the ADA, state that well-planned vegan diets are healthy and nutritionally adequate, and may provide health benefits in the prevention and treatment of certain diseases. It seems like no matter what your dietary preferences are, a healthy lifestyle can be achieved on or off a vegan diet.

1. （1） Which example illustrates he/she is a vegan?

   A . His /Her diet is made up of large amounts of plant-based carbohydrates. B . He /She eats meat on special occasions, usually pork, as well as small amounts of fish on a weekly basis. C . He /She believes small amounts of animal products are vital to good health, and they insist on eating them every day. D . He /She fries French fries by animal oil.
3. （2） Which statement is TRUE according to the passage?

   A . Finland is the leading country in the world to study veganism. B . Vegetarians had the highest mean BMI. C . Vegan diets may be helpful in the treatment of cancer. D . The number of vegan in the U. S. is on the rise.
5. （3） Vitamin B-12 can be got from     .

   A . various vegetables B . soy milk and cereals C . water D . sunbath
7. （4） What is the writer's attitude towards going vegan?

   A . Objective. B . Subjective. C . Critical. D . Disapproval.