Unit3 Food and Culture基于高考外刊源文设计单元主题作业 （学生版+教师版）-2025-2026学年人教版高中英语选择性必修第二册

基于高考外刊源文设计单元主题作业 ———XB2 Unit3 Food and Culture 阅读下列短文，从每题所给A、B、C和D四个选项中，选出最佳答案。 A Vitamins and minerals are essential nutrients that our bodies cannot produce, so we must obtain them from food. Though only needed in small amounts, a balanced diet—rich in vegetables, fruits, grains, nuts, dairy, and fish—is the best way to get them. However, many people today rely on processed foods, which may lack these nutrients. Research on the benefits of supplements is mixed. Taking too much of certain vitamins, such as vitamin D or A, can be harmful. For example, studies show that beta-carotene, an antioxidant, may increase lung cancer risk in smokers. This suggests that consuming more vitamins than necessary does not always improve health and may even cause harm. Still, some groups can benefit from supplements. People with little sunlight exposure may need vitamin D, which studies link to lower cancer deaths and fewer autoimmune diseases. Older adults might take a daily multivitamin to reduce cancer risk and slow memory decline. Pregnant women are advised to take folic acid to prevent birth defects. Additionally, those who rarely eat fish could benefit from omega-3 supplements, and individuals with digestive disorders like Crohn’s disease may need extra nutrients. For most people, a healthy diet remains the best strategy. Nutrients from food are better absorbed and come with added benefits, such as fiber. Supplements cannot replace a balanced diet but may help those with confirmed deficiencies or special needs. 1. What is the main reason people may lack essential vitamins and minerals A. They do not exercise enough. B. They rely too much on processed foods. C. Their bodies produce fewer nutrients as they age. D. They avoid taking supplements. 2. According to the passage, why can excessive vitamin intake be harmful A. It may increase the risk of certain diseases. B. It makes people dependent on supplements. C. It reduces the effectiveness of other nutrients. D. It leads to a loss of appetite. 3. Which group is specifically mentioned as benefiting from vitamin D supplements A. Athletes B. People with little sun exposure C. Teenagers D. Vegetarians 4. What is the author’s general recommendation regarding supplements A. Everyone should take a daily multivitamin. B. Supplements should replace unhealthy diets. C. Healthy eating is better than relying on supplements. D. High doses of vitamins are safe for most people. 正确答案和解析： 1. 答案：B解析：第一段最后一句 "However, many people today rely on processed foods, which may lack these nutrients."文章开头指出维生素和矿物质必须从食物中获取，随后通过转折词“However”强调，现代人依赖加工食品是导致营养素缺乏的主要原因，因为加工食品可能缺乏这些必需营养。 2. 答案：A解析：第二段第二、三句 "Taking too much of certain vitamins...can be harmful. For example, studies show that beta-carotene...may increase lung cancer risk in smokers."原文明确说明过量摄入某些维生素可能“有 ... ...