题目内容：
根据材料，回答问题。【教学材料】
Pompeii: The facts
August 24, in the year AD 79, began normally for the people in Pompeii, a town at the foot of Mount Vesuvius. Farmers went out to their fields, shopkeepers set out their goods for sale,craftspeople opened their workshops and the rich walked to the public baths while their servants cleaned their houses and washed their clothes. Unfortunately, the end of the day was far from normal for the 20,000 citizens of Pompeii.
Early in the afternoon, when many people were resting from the heat of the day, Mount
Vesuvius erupted. Millions of tonnes of ash, lava and pumice poured onto the surrounding hillside and over the town of Pompeii and other towns and villages. By evening Pompeii was buried under 3-5 meters of ash and mud, and at least 2,000 men, women and children were buried with their town.
【教学实录】
Teaching Procedures
Step 1 Leading-in (5 minutes)
Show students pictures of different natural disasters and some historical facts of them..
Then show the students pictures of Pompeii and tell a short story of Pompeii.
(Justification: This step will warm up the class, and students will become quite curious and be attracted by Pompeii's mysteries.)
Step 2 Presentation (20 minutes)
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(Purposes: ... )
Step 3 Consolidation (10 minutes)
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(Purposes: ... )
Step 4 Summary and Homework (5 minutes)
Teacher will show the flash cards of words & sentences to lead students to read and reviewthem again.
The homework is to write at least 10 sentences to describe a nature disaster.
(Purposes: The homework of writing will help students to use the words to describe their nature disaster, and strengthen their interests and confidence of learning English.)
案例分析(满分10分)
以上教学案例是根据所给教学材料进行的教学环节的部分实录。根据新课程理念，对教师导入环节的教学方法及作用进行分析。
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答案解析：