contents introduction ielts reading activitiesunit one: natural phenomenaunit two: important events in human historyunit three: transportationunit four: languageunit five: environment protectionunit six: animalsunit seven: architectureunit eight: social issuesunit nine: medical scienceunit ten: agriculture, industry and commerceunit eleven: eductionunit twelve: science and technologyielts reading tests test 1 test 2 test 3answer keyielts reading answer sheet