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Unit 4 Life on Mars Integrated skills I. Teaching aims and learning objectives By the end of the lesson, students should be able to: 1. understand the programme and get useful information from it。 2. talk about whether they would like to live on Mars. II. Teaching contents 1. New words and phrases: risk, percentage, disadvantage, carry out, get ill from, after all 2. New structures: However, some other students were worried about living there. They were even afraid of aliens ther