新一代大学英语视听说教程1 U2ppt课件.ppt

Food and Health,Unit 2,Warm-up,01,Listening and Speaking,02,Viewing and Speaking,03,CONTENTS,Project,04,1,Warm-up,Work in pairs on the following activities.,Read the food terms and the descriptions carefully. Then match the descriptions with the terms.,Step 1,Warm-up,processed food,Warm-up,1 It is food that is grown or produced without synthetic (人造的) pesticides or chemical fertilizers.2 It is food that is specially treated to change color and keep fresh, etc.3 It is food that is grown within a reasonable distance from where it is eaten. It does not spend days or weeks to be transported and is therefore generally fresher.4 It is food that is produced from organisms that have had specific changes introduced into their DNA using the methods of genetic engineering.5 It is food that is not processed or refined, or that is processed and refined as little as possible, before being consumed. It is food in its natural state.,organic food,local food,GM food,whole food,Work in pairs on the following activities.,List the foods that you ate for breakfast, lunch andsupper yesterday. For each of them, decide whetherit is genetically modified, local, whole, processed, or organic.,Step 2,Warm-up,Reference answers,Warm-up,Additional Activity,Read the following quotes about healthy eating. Try to explain the quotes with examples or your personal experiences.1 Those who think they have no time for healthy eating will sooner or later have to find time for illness. Edward Stanley2 The only way to keep your health is to eat what you dont want, drink what you dont like, and do what youd rather not. Mark Twain,Warm-up,Reference answers,1 Main points: Healthy eating is not just about keeping a healthy weight it affects ones total state of well-being. Poor eatinghabits are linked to a large number of diseases such as heart disease, stroke and diabetes. My father, for example, always buys organic food even if it is more expensive. He tries to ensure a healthy and balanced diet for the family. 2 Main points: To stay healthy, you will have to eat those vegetables and fruits which you might not like as much as junk food. You will have to get up early in the morning, exercise regularly, or take the stairs instead of the elevator. In other words, it takes some effort to be healthy.,Warm-up,2,Listening and Speaking,Topic OneGenetically modified food,1 Listen to a conversation on GM food and decide whether the statements are true or false. Write “T” for “true” and “F” for “false”.,Listening and Speaking,Genetically modified food,Listening and understanding,1 The man is in favor of GM food but the woman is against it.2 The woman thinks that she needs to do more reading on GM food.3 The man thinks that controls on GM food in most countries are loose.4 The man thinks that the woman is cautious about GM food.5 The woman does not like the fact that some food companies are using her for their experiments on GM food.6 The woman finally agrees with the man.,T,F,F,F,T,F,2 Listen to the conversation again and complete the table with what you hear.,Listening and Speaking,Genetically modified food,Listening and understanding,Genetically modified food,Listening and understanding,safer,tighter controls,vegetables,extinct,decreasing in numbers,poor countries,whole ecosystem,Listening and Speaking,3 Although GM food has been on supermarket shelves for over a decade, there is still extensive controversy about it. Work in two groups and hold an informal debate on the topic “Is GM food beneficial?”. You can base your argument on what youve heard from the conversation, your own experience and reasoning, and what youve learned from books, newspapers, or the Internet.,Listening and Speaking,Genetically modified food,Thinking and speaking,Listening and Speaking,Genetically modified food,Thinking and speaking,Topic TwoTruth about organic food labels,1 Understanding food labels can help you make healthy decisions when you shop for food. Now listen to a program twice and complete the table with what you hear.,Listening and Speaking,Truth about organic food labels,Listening and understanding,Listening and Speaking,Truth about organic food labels,organic,less than,at least,95%,100%,the outdoors,natural diet,being kept in small cages,being raised,2 The program you have listened to is about food labels. The chart below shows what consumers look for on food labels in America. Work in groups to describe the chart briefly and give comments on their claims.,Listening and Speaking,Thinking and speaking,Truth about organic food labels,Listening and Speaking,Thinking and speaking,Truth about organic food labels,Listening and Speaking,Thinking and speaking,Here are some useful expressions for describing the data: Of all the people who were questioned / interviewed, . Opinions are divided about . Approximately half those respondents say that . The majority of people think that . Nearly two out of three people report that .,Truth about organic food labels,Listening and Speaking,Reference answers,The chart shows what consumers look for when it comes to food labeling. When shopping for food, of all the people who were interviewed, about two out of three report that they look for the words “Locally grown” on labels, while 59% check to see if the products they are buying are natural. Half of the people say that they would look for information about artificial growth hormones on food labels. Other keywords that consumers look for on food labels include “Pesticide-free” (49%), “Organic” (49%), “No artificial ingredients” (48%), and so on. According to the chart, consumers care a lot about how their food is produced. They are looking for food that is produced locally and in an environmentally-friendly way.,Truth about organic food labels,Topic ThreeMeat or not Four types of vegetarians,1 Depending on what they eat, vegetarians can be divided into different types. Now listen to a talk about the four types of vegetarians and tick the food they eat.,Listening and Speaking,Meat or not Four types of vegetarians,Listening and understanding,2 Listen to the talk again and complete the answers to the questions with what you hear.,Listening and Speaking,Meat or not Four types of vegetarians,Listening and understanding,1 What are dairy products?They refer to things like _.2 What will vegans use as a source of omega-3?They will use a _ or flaxseed instead of _.3 Why are semi-vegetarians not truly vegetarians?Because they still _ occasionally or some type of animal product.,milk, cheese, yoghurt,marine source like marine algae,fish oil supplements,eat meat,3 The talk you have listened to tells about vegetarians and their diet. Now work in pairs on the following activities.,Listening and Speaking,Thinking and speaking,Discuss the questions.1 Why do some people choose to become vegetarians?2 What are the health benefits of a vegetarian diet?3 What are the health risks in becoming a vegetarian?,Step 1,Meat or not Four types of vegetarians,Listening and Speaking,Thinking and speaking,1 Why do some people choose to become vegetarians? Most of the reasons fall into one of the following categories. Health concerns: Vegetarians believe that a healthy vegetarian diet can significantly decrease the risk of many chronic diseases such as diabetes and heart disease. Religious restrictions: Some believers of some religions such as Buddhism may refuse to eat meat. Environmental concerns: They assert that the large-scale meat and poultry production is environmentally unsustainable. Animal rights issues: Ethical vegetarians are concerned about animal cruelty. They say that animals are treated horribly prior to and during slaughter.,Meat or not Four types of vegetarians,Listening and Speaking,Thinking and speaking,2 What are the health benefits of a vegetarian diet? Some people believe that vegetarians are at a lower risk for developing heart disease, obesity, diabetes, hypertension and certain cancers. This is because a healthy vegetarian diet is typically low in fat and high in fiber.,Meat or not Four types of vegetarians,3 What are the health risks in becoming a vegetarian? There can be risks linked to vegetarian diets associated with a lack of nutrients. If vegetarians are not careful to get all the necessary nutrients, they could experience a lack of protein, iron, zinc, calcium, vitamin B12, vitamin D and omega-3 fatty acids.,Listening and Speaking,Thinking and speaking,Read the situation. Then role-play a conversation about vegetarianism based on your answers in Step 1.Student A You are a vegetarian and you never eat meat. You think it is barbaric ( 野蛮的) to eat meat and you are convinced it is much healthier not to eat any meat products.Student B You love eating meat and cant imagine a meal without any meat in it. You think that people need to eat meat to get enough proteins and keep healthy.,Step 2,Meat or not Four types of vegetarians,Listening and Speaking,Thinking and speaking,Reference answersB: There are a lot of differences in what weve got for lunch today. Ive got some pork and you have a vegetarian salad with nuts. So why do you become a vegetarian?A: I dont eat meat because I think it is wrong to kill animals for their meat. Do you know that 55 billion animals are killed every year for meat production?B: Yes, but these animals are bred for food. I think meat production is similar to producing any other food product. We humans shouldnt get too sentimental about the animals. Besides, we need to eat meat in order to stay healthy.,Meat or not Four types of vegetarians,Listening and Speaking,Thinking and speaking,A: Do you really believe that eating meat would help you stay healthy? Research shows that vegetarians are at a lower risk for developing many diseases including some of the most common cancers, heart disease, stroke, obesity and diabetes. In fact, this is another reason why I choose to become a vegetarian.B: But humans are omnivores. We function best when we eat both animals and plants. There are some nutrients that can only be gotten from animals. Take vitamin B12 for example. It is an important vitamin for many basic bodily functions such as blood cell production and proper nerve functioning, but it is not found in most of the plants. In fact, B12 deficiency is very common in vegans.,Meat or not Four types of vegetarians,Listening and Speaking,Thinking and speaking,A: Yes, vegetarians especially vegans can be exposed to some health risks because of our meatless diet. So we can take some foods or supplements to compensate for the missing nutrients in our diet.B: Are there other reasons why people become vegetarians?A: Yes, of course. Some people do not eat meat for religious or ethical reasons. For example, many Buddhists follow a vegetarian diet. Some people are allergic to protein from meat so they cant eat meat. And some vegetarians refuse to eat meat for environmental concerns. You know many forests are cut down to raise animals for meat. This really has to stop.,Meat or not Four types of vegetarians,Listening and Speaking,Thinking and speaking,B: To be honest, I really dont see why eating meat is a big deal. I think the choice to eat meat or not is very personal. So lets finish whats on our own plate.,Meat or not Four types of vegetarians,3,Viewing and Speaking,Topic OneHow to avoid processed foods in a healthy diet,How to avoid processed foods in a healthy diet,Viewing and understanding,1 If you are trying to eat healthily, perhaps you have been told to stay away from processed foods. While thats great advice, it seems many people are confused about what processed foods are and what makes them so dangerous to ones health. Now watch a video clip and complete the answers to the questions with what you hear.,Viewing and Speaking,1 What are processed foods?They are foods that have been altered from _.2 Why can processed foods stay fresh for months?Its because food manufacturers use _ to prolong a products _.3 What are trans fats?They are oils infused with _.4 What is true about food labeled “trans fat free”?It may contain _ of trans fat per serving.5 What do manufacturers say about high fructose corn syrup compared with sugar?It is nutritionally _ sugar.6 What are the negative effects of processed foods?They not only create health risks, but also make you _, according to Dr. Doris Day.,Viewing and Speaking,their natural state,man-made ingredients,shelf life,hydrogen,up to a half gram,the same as,look old,How to avoid processed foods in a healthy diet,Viewing and understanding,2 Watch the video clip again and complete the table with what you hear.,Viewing and Speaking,Viewing and Speaking,bad,good,plastic,cells,communicate or talk,cancer,packaged foods,baked,fat,desire more,high blood pressure,How to avoid processed foods in a healthy diet,Thinking and speaking,3 Weve learned from the video clip about the health risks of trans fats. What can be done to reduce the consumption of trans fats? Discuss in groups and try to look at the question from different perspectives, e.g. the government, food producers, doctors, restaurants, and consumers.,Viewing and Speaking,How to avoid processed foods in a healthy diet,Reference answers,The government should increase public awareness of the health risks of consuming trans fats and adopt guidelines regarding the sale and use of foods containing trans fats. Food producers need to find innovative ways to avoid using trans fats in foods and make sure that food labels provide clear and accurate information that helps consumers make food choices. Instead of simply prescribing drugs, doctors should tell their patients to reduce or cut trans fats out of their diet. Restaurants should change their cooking oils to ones that do not contain trans fats. The consumers should read the nutrition facts label and ingredient list carefully. They should check the ingredient list to avoid all trans fats. Consumers should also choose restaurants that do not use trans fats.,Viewing and Speaking,Topic TwoWhats wrong with our food “system”?,Whats wrong with our food “system”?,Viewing and understanding,1 You are going to watch a speech from 11-year-old Birke Baehr, in which he describes the dark side of the industrialized food system and presents his opinions on green and localized food production. Watch the video clip twice and complete the diagram with what you hear.,Viewing and Speaking,Viewing and Speaking,Problems with the industrializedfood system,Possiblesolutions,Conventional farmers use 1) _ made from fossil fuels that they mix with the dirt to make plants grow.,Harmful chemicals are sprayed on fruits and vegetables to 2) _.,Food is irradiated so that it can last longer and travel thousands of miles from where its grown to 3) _.,We can buy our food directly from 4) _, or our neighbors who we know in real life.,We can choose organic food even if it is 5) _, because it is wise to choose to pay the farmer rather than the hospital.,We can let children know more about food and wher