教学目标与核心素养：
1. Help the students learn some new words related to the topic of this unit.
2. Help the students understand the main idea of the text based on prediction and reading. Grasp the meaning of the topic and the writer's writing purpose.
3. Help the students acquire the key information and comb the links between the information.
教学重难点
教学重点：
1. Teach the students to get the main idea.
2. Teach the students to analyse the history and reasons behind different English and learn to make a survey.
教学难点：Help the students understand the text, the writer's writing purpose and the inner logical links.
