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：根据所提供的信息和语言素材设计一节课的教学方案。教案没有固定格式，但须包含下列要点：

1.teaching objectives

2.key and difficult points

3.major steps and time allocation

4.activities and justification

教学时间：45分钟

学生概况：某城镇普通中学高中一年级第一学期学生，班级人数40人。多数学生已经达到《普通高中英语课程标准（实验）》五级水平。学生课堂参与积极性一般。

语言素材：

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,crafts people 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 tons 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 metres of ash and mud,and at least 2,000 men,women and children were buried with their town.