请认真阅读下列材料，并按要求作答。[图1]请根据上述材料，完成下列任务：
依据拟定的教学目标，设计导入和操练环节的教学活动并说明设计理由。（20分）
Step1 Warming up & Lead inDaily greeting.Play the song Old MacDonald for the students and ask the question "What can you hear in the song?"Play the recording for the sounds of some farm animals, like "Meow-Meow-",and ask "What is it?"理由：营造和谐的英语学习氛围，使学生带着愉快的心情进入学习状态。通过诵读激发兴趣，同时复习旧知引出新单词。Step2 Presentation and practice New wordsAsk students to learn the new words "chick, hen, pig, dog, cat" by showing the pictures of them in the classroom.Enable students to read the new words by the method of phonetics. Ask students to read them after the teacher. And then guide students to spell the words.Present pictures of some body parts of different animals and let students guess "What is it ?" Use this method to introduce each animal. 理由：通过展示动物的某个部分，让学生猜一猜想一想，激发了学生的学习兴趣，又增长了动物知识。Sentence patterns Ask students to listen to tape and find thesentence patterns about asking and answering the names and numbers of the things. Teacher will guide students to go throw thepicture on the right side. Point to a group of pig and ask "What are they?"Students : "They are pigs."Teacher："Let's count. One, two, three, four."(Point to every pig that on the picture at the same time) How many pigs?"Students："Four."Choose a pair of students to finish the tasks about other animals.3. Sing a chant to help to master the sentence patterns easily.理由：通过朗读句子，及时复习新单词，又使学生注意到了s的不同发音。
