下面是一篇以“Holiday"为主题的小学英语听力教学过程，请用中文从以下两个方面进行简要评析。
1．教师角色；
2．教学活动。
教学过程：
Step 1 Pre-listening
Activity 1: Teacher"s introduction of background knowledge.
(1)Basic knowledge about western holidays.
(2)Basic knowledge about Chinese holidays.
Activity 2: Show the pictures of different holidays through multi-media
Activity 3：Students’guessing
(1)What will be included in the tape
(2)Try to construct students with the new words in the table.
Step 2: While-listening
Listen to the passage twice to justify their guessing.
Activity 1: Answer the following questions read by the teacher:
Q1: When is Christmas/Spring Festival
Q2: What do people usually do at Mid-Autumn Festival
Q3: What did Su Hai do last Spring Festival
Q4: Is Easter a Chinese Festival
Q5: When"s Halloween
Q6: What do people usually do at Halloween
Activity 2: Finish the exercises in the textbook
Step 3 Post-listening
Activity 1: Based on the words listed, students are asked to rell Part A.
Activity 2: Write a short passage about the holidays.