根据提供的信息和语言素材设计教学方案，用英文作答。

设计任务：请阅读下面学生信息和语言素材，设计20分钟的英语阅读教学设计，该方案没有固定的格式，但须包含下列要点：

teaching objectives

teaching contents

key and difficult points

major steps and time allocation

activities and justifications

教学时间：20分钟

学生情况：某城镇普通中学初中二年级（八年级）学生，班级人数40人，多数学生已经达到《义务教育英语课程标准（2011年版）》三级水平。学生课堂积极性一般。

语言素材：

   If you go to a fast food restaurant or a snakebar you will probably see a lot of teenagers. Today, many teenagers areoverweight, and some of this is because of their bad eating habits. Mostteenagers love food with a lot of fat, oil, and sugar. People often call thistype of food “junk food".

   But food eating habits go beyond fast food.Many teenagers find it difficult to eat healthy. Some don't have breakfastbefore they go to school. During the day, some don't have a proper meal forlunch. In a recent survey at one school, scientists found that over two-thirdsof the students didn't follow a healthy diet. Nearly half of the studentsdidn't like vegetables, and many of them don't like to eat fruits. Theypreferred to eat food with a lot of salt, sugar, or fat.

   Parents today also worryabout their children's diet. Some doctors give the following advice:

● Teenagers shouldn't eat too much junk food.

●Teenagers shouldn't eat food with too much salt. Salt can causehigh blood pressure in the future.     .

● Teenagers should eat food with less fat, oil, and sugar.

●Teenagers need to eat some fruit and vegetables every day. Fruitand vegetables are rich in vitamins and have little fat.

● Teenagers need to drink more milk. Milk will help their bonesgrow.

● Teenagers need to eat breakfast every day. This is good fortheir body and mind.

  Teaching Contents：    ’   +

    The passage tells usthat many teenagers who are overweight have bad eating habits, so that thedoctors give some advice about their diet.

    Teaching Objectives:

    1. Knowledge objectives:

    (1) Students can masterthe main idea of this passage and know the advantages of the healthy eatinghabits.

    (2) Students can understand the meaning andusage of the new words and expressions, such as junk food, overweight, nearly,too much and be good for.

2. Ability objectives:

Students can improve theirreading and communicating abilities through class activities.

    3. Emotional objectives:

    (1) Students can knowthe importance of keeping a healthy diet.

    (2) Students cancooperate with others actively, and improve their confidence of speakingEnglish.

    Teaching Key &Difficult Points:

    Teaching key points:

    (1) Students can makeuse of the new words and expressions, such as junk food, overweight, nearly, toomuch and be good for.

    (2) Students cancomprehend the main idea of the passage.

    Teaching difficultpoints:

    (1) Students can use the new knowledgecorrectly in their daily life.

    (2) Students canunderstand it is very necessary to form the healthy eating habits and begin torefuse the junk food.

     Major Steps:

     Step l Pre-reading (6minutes)

1.Show the table on the blackboard and ask students to discuss about the junkfood and healthy food

Then ask students to fill in the blanks and then check the answerin pairs.

 2. Show the new words andexpressions, such as junk food, overweight, nearly, too much and be good for.

   (1) junk food: is foodthat is unhealthy and/or has little or no nutritional value.

   (2) overweight: too heavy and fat

   (3) nearly: not quite; not completely

   (4) too much: more than enough

   (5) be good for: behelpful to

   (Justification: Throughthis 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 helpthem understand the passage.)

  Step 2 While-reading (8minutes)

  At this step ask thestudents to do two activities.

  Activity l: Fast reading

  Students will be given twominutes to read the short passage quickly, and then conclude the main idea.

  Activity 2: Careful reading

  Ask the students to readthe passage again and answer the following questions. For instance:

  A: How many studentsdidn't follow a healthy diet according to the scientists' survey?

  B: How many studentsdidn't like vegetables?

  C: Why the doctors advisethat teenagers need to eat some fruit and vegetables every day'?

  (Justification: Differentways of exploiting the text can help students not merely to cope with oneparticular text in class but to develop their reading strategies and readingability.)

  Step 3 Post-reading (6minutes)

Choosesome volunteers to do the interview. One of the partners acts as theinterviewer and the other interviewee. Make an interview about the topic of thehealthy eating habits, using the knowledge they have learnt today.

 (Justification: Students dothe interview in their own way, which helps to apply what they learn in thisperiod in real situation. At the same time , students can have a betterunderstanding of the topic of food.)