【答案解析】Teaching Contents: The passage tells us that many teenagers who are overweight have the bad eating habits, so that the doctors give some advice about their diet. Teaching Objectives: (1) Knowledge objectives ①Students can master the main idea of this passage and know the advantages of the healthy eating habits.. ② Students can understand the meaning and usage of the newwords and expressions, such as junk food,overweight, nearly, too much and be good for. (2) Ability objectives Students can improve their reading and communicating abilities through class activities. (3) Emotional objectives . ① Students can know the importance of keeping a healthy diet. ② Students can cooperate with others actively, and improve their confidence of speaking English. Teaching Key & Difficult Points: (1) Teaching key points ① Students can make use of the new words and expressions, such as junk food, overweight, nearly, too much and be good for. ② Students can comprehend the main idea of the passage. (2) Teaching difficult points ① Students can use the new knowledge correctly in their daily life. ② Students can understand it is very necessary to form the healthy eating habits and begin to refuse the junk food. Major Steps: Step 1 Pre-reading (6 minutes) (1) Show the table on the blackboard and ask students to discuss about the junk food and healthy food. Then ask students to fill in the blanks and then check the answer in pairs. (2) Show the new words and expressions, such as junk food, overweight, nearly, too much and be good for. ① junk food: is food that is unhealthy and/or has little or no nutritional value. ②overweight: too heavy and fat ③ nearly: not quite; not completely ④ too much: more than enough ⑤ be good for: be helpful to (Justification: Through this step, students can know and divide the junk food and the healthy food. Meanwhile,the students can learn the new words and phrases, which can help them understand the passage.) Step 2 While-reading (8 minutes) At this step ask the students to do two activities. Activity 1: Fast reading Students will be given two minutes to read the short passage quickly, and then conclude the main idea. Activity 2: Careful reading Ask the students to read the passage again and answer the following questions. For instance: A: How many students didn't follow a healthy diet according to the scientists' survey? B: How many students didn't like vegetables? C: Why the doctors advise that teenagers need to eat some fruit and vegetables every day? (Justification: Different ways of exploiting the text can help students not merely to cope with one particular text in class but to develop their reading strategies and reading ability.) Step 3 Post,reading (6 minutes) Choose some volunteers to do the interview. One of the partners acts as the interviewer and the other interviewee. Make an interview about the topic of the healthy eating habits, using the knowledge they have learnt today. (Justification: Students do the interview in their own way, which helps to apply what they learn in this period in real situation. At the same time, students can have a better understanding of the topic of food.)