Teaching Aims
Enable the students to grasp and remember the detailed information of the reading material.
Let students understand the general idea of the passage.
Teaching Procedures
课前预习：
Before reading the passage, preview some new words and useful expressions of the text.
课内探究：
Leading in: (Showing some pictures)
自主学习
Task 1 Read the explanation and speak out the word it explains.
1)the things that are needed for a particular purpose or activity___________ ___________
2)the burning rocks, smoke, etc are thrown out from the volcano_______
